April 29, 2009 -- In his first 100 days in office, President Obama has demonstrated a clear departure from his predecessor. From relaxing marijuana enforcement laws to releasing torture memos, the new administration has moved rapidly to revoke and alter policies that marked the legacy of the Bush team.

Obama "is pleased with his actions thus far, understanding that the American people are certainly not going to grade his administration or our efforts... just by the actions of the first 95 days," White House Press Secretary Robert Gibbs said.

Even before he entered the White House, the 44th president advised his transition team to draft an executive order to close down the detainee center at Guantanamo Bay. The latest in the series of moves has been the release of the so-called "torture memos" detailing the authorization and legalization of harsh interrogation techniques by Bush-era officials. The Obama team has also taken a visibly different approach to energy and environmental policy.

The swift-moving president says he is trying to fulfill his campaign promises and supporters applaud his efforts. Critics say he could be putting too much on his already-full plate.

Here is a list of the Bush administration policies and laws that Obama has reversed so far:

From Drugs to Gay Rights to Health Policy

Endorsing Gay Rights

On March 18, the Obama administration formally endorsed a United Nations statement urging world leaders to decriminalize homosexuality, a declaration that less than three months ago Bush refused to sign.

"The United States supports the U.N. Statement on 'Human Rights, Sexual Orientation, and Gender Identity,' and is pleased to join the other 66 U.N. member states who have declared their support of this Statement that condemns human rights violations based on sexual orientation and gender identity wherever they occur," the State Department said in a statement. "We join with the other supporters of this Statement and we will continue to remind countries of the importance of respecting the human rights of all people in all appropriate international fora."

In December 2008, 66 of the U.N.'s 192 member countries signed the declaration, with the United States being the only Western nation not to do so, a move that drew fierce criticism from gay rights and civil liberties groups.

The Bush administration defended the move by claiming the declaration needed further review. The Obama administration has a different legal interpretation. The State Department said that the endorsement "commits us to no legal obligations."

More changes to Bush's rules on homosexuality are likely to come in the next four years. Obama promised in his campaign to overturn the "Don't Ask, Don't Tell" policy that stemmed from the 1993 law that forbade homosexuals from serving in the U.S. military.

Stem Cell Research

In his latest rollback of Bush administration policies, President Obama signed an executive order Monday lifting the 7½-year ban on federal funding for embryonic stem cell research and a memorandum covering all scientific research. In a less-than-subtle criticism of Bush's ban, Obama said, "In recent years, when it comes to stem cell research, rather than furthering discovery, our government has forced what I believe is a false choice between sound science and moral values. In this case, I believe the two are not inconsistent," the president added before signing the order.

Obama said throughout his presidential campaign that he would overturn the ban if elected. President Bush banned federal funding for such research in August 2001, citing "moral concerns raised by the new frontier of human embryonic stem cell research. Even the most noble ends don't justify the means." Nearly six in ten Americans support loosening restrictions on federal funding of stem cell research. Proponents of stem cell research say Obama's order is a promising sign that progress can be made after a more-than-eight-year stalemate, while others say it is only a tiny step. Anti-abortion groups say the research is unethical and unreliable.

Global Gag Rule

The debate on whether U.S. government should fund international family planning groups that provide abortions or related services has been brewing for decades. The "Mexico City Policy" that was signed into law by Ronald Reagan in 1984 was overturned by Bill Clinton in 1993 and restored by Bush in 2001. So, it was only a matter of time before the next Democratic president also rescinded his predecessor's rule.

Obama overturned the policy on Jan. 23, just days after he took the oath of office. "For the past eight years, [the restrictions] have undermined efforts to promote safe and effective voluntary family planning in developing countries," Obama said in a statement. Some international family planning groups hailed the decision, saying that Bush's ban discriminated against the world's poor by denying U.S. aid to groups that may be involved in abortion, but also work on other aspects of reproductive health care and HIV/AIDS. Obama's move was also met by criticism by Republicans and anti-abortion groups.

Provider Conscience Rule

Breaking with Bush on health care, Obama wants to give more power back to the patients on whether health care providers should provide controversial services. The administration revoked the Bush-era "Provider Conscience" rule that created more regulations to prevent those who refuse to hire doctors and nurses opposed to abortion rights from receiving federal funds. The move was applauded by abortion rights advocacy groups, who say the limits restricted patients' rights.

War Games

From Drugs to Gay Rights to Health Policy

Shifting Away From Calif. Pot Busts

Signaling a drastic shift in the Bush administration's policies on drugs, Obama's appointed Attorney General, Eric Holder, said federal agents will relax their enforcement of marijuana laws and go after only those distributors who violate both state and federal law. California is one of 13 states that have either legalized or decriminalized the use of medical marijuana and permits its sale for medical purposes. However, it still violates federal law and under the previous administration, authorities targeted medical marijuana sellers under federal laws even if they complied with state laws.

As a presidential candidate, Obama vowed to bring change in policies related to medical marijuana use. Advocacy groups applauded the change but raised their concerns about more than two dozen California cases that are hanging in a limbo in federal court. The move comes at a time when the Obama administration is taking a tougher stance on the problem of drug and weapons trade along the U.S.-Mexico border. Other states that permit marijuana for medical purposes are Alaska, California, Colorado, Hawaii, Maine, Michigan, Montana, Nevada, New Mexico, Oregon, Rhode Island, Vermont and Washington.

Endorsing Gay Rights

On March 18, the Obama administration formally endorsed a United Nations statement urging world leaders to decriminalize homosexuality, a declaration that less than three months ago Bush refused to sign.

"The United States supports the U.N. Statement on 'Human Rights, Sexual Orientation, and Gender Identity,' and is pleased to join the other 66 U.N. member states who have declared their support of this Statement that condemns human rights violations based on sexual orientation and gender identity wherever they occur," the State Department said in a statement. "We join with the other supporters of this Statement and we will continue to remind countries of the importance of respecting the human rights of all people in all appropriate international fora."

In December 2008, 66 of the U.N.'s 192 member countries signed the declaration, with the United States being the only Western nation not to do so, a move that drew fierce criticism from gay rights and civil liberties groups.

The Bush administration defended the move by claiming the declaration needed further review. The Obama administration has a different legal interpretation. The State Department said that the endorsement "commits us to no legal obligations."

More changes to Bush's rules on homosexuality are likely to come in the next four years. Obama promised in his campaign to overturn the "Don't Ask, Don't Tell" policy that stemmed from the 1993 law that forbade homosexuals from serving in the U.S. military.

Stem Cell Research

In his latest rollback of Bush administration policies, President Obama signed an executive order Monday lifting the 7½-year ban on federal funding for embryonic stem cell research and a memorandum covering all scientific research. In a less-than-subtle criticism of Bush's ban, Obama said, "In recent years, when it comes to stem cell research, rather than furthering discovery, our government has forced what I believe is a false choice between sound science and moral values. In this case, I believe the two are not inconsistent," the president added before signing the order.

Obama said throughout his presidential campaign that he would overturn the ban if elected. President Bush banned federal funding for such research in August 2001, citing "moral concerns raised by the new frontier of human embryonic stem cell research. Even the most noble ends don't justify the means." Nearly six in ten Americans support loosening restrictions on federal funding of stem cell research. Proponents of stem cell research say Obama's order is a promising sign that progress can be made after a more-than-eight-year stalemate, while others say it is only a tiny step. Anti-abortion groups say the research is unethical and unreliable.

Global Gag Rule

The debate on whether U.S. government should fund international family planning groups that provide abortions or related services has been brewing for decades. The "Mexico City Policy" that was signed into law by Ronald Reagan in 1984 was overturned by Bill Clinton in 1993 and restored by Bush in 2001. So, it was only a matter of time before the next Democratic president also rescinded his predecessor's rule.

Obama overturned the policy on Jan. 23, just days after he took the oath of office. "For the past eight years, [the restrictions] have undermined efforts to promote safe and effective voluntary family planning in developing countries," Obama said in a statement. Some international family planning groups hailed the decision, saying that Bush's ban discriminated against the world's poor by denying U.S. aid to groups that may be involved in abortion, but also work on other aspects of reproductive health care and HIV/AIDS. Obama's move was also met by criticism by Republicans and anti-abortion groups.

Provider Conscience Rule

Breaking with Bush on health care, Obama wants to give more power back to the patients on whether health care providers should provide controversial services. The administration revoked the Bush-era "Provider Conscience" rule that created more regulations to prevent those who refuse to hire doctors and nurses opposed to abortion rights from receiving federal funds. The move was applauded by abortion rights advocacy groups, who say the limits restricted patients' rights.

War Games

Endorsing Gay Rights

On March 18, the Obama administration formally endorsed a United Nations statement urging world leaders to decriminalize homosexuality, a declaration that less than three months ago Bush refused to sign.

"The United States supports the U.N. Statement on 'Human Rights, Sexual Orientation, and Gender Identity,' and is pleased to join the other 66 U.N. member states who have declared their support of this Statement that condemns human rights violations based on sexual orientation and gender identity wherever they occur," the State Department said in a statement. "We join with the other supporters of this Statement and we will continue to remind countries of the importance of respecting the human rights of all people in all appropriate international fora."

In December 2008, 66 of the U.N.'s 192 member countries signed the declaration, with the United States being the only Western nation not to do so, a move that drew fierce criticism from gay rights and civil liberties groups.

The Bush administration defended the move by claiming the declaration needed further review. The Obama administration has a different legal interpretation. The State Department said that the endorsement "commits us to no legal obligations."

More changes to Bush's rules on homosexuality are likely to come in the next four years. Obama promised in his campaign to overturn the "Don't Ask, Don't Tell" policy that stemmed from the 1993 law that forbade homosexuals from serving in the U.S. military.

Stem Cell Research

In his latest rollback of Bush administration policies, President Obama signed an executive order Monday lifting the 7½-year ban on federal funding for embryonic stem cell research and a memorandum covering all scientific research. In a less-than-subtle criticism of Bush's ban, Obama said, "In recent years, when it comes to stem cell research, rather than furthering discovery, our government has forced what I believe is a false choice between sound science and moral values. In this case, I believe the two are not inconsistent," the president added before signing the order.

Obama said throughout his presidential campaign that he would overturn the ban if elected. President Bush banned federal funding for such research in August 2001, citing "moral concerns raised by the new frontier of human embryonic stem cell research. Even the most noble ends don't justify the means." Nearly six in ten Americans support loosening restrictions on federal funding of stem cell research. Proponents of stem cell research say Obama's order is a promising sign that progress can be made after a more-than-eight-year stalemate, while others say it is only a tiny step. Anti-abortion groups say the research is unethical and unreliable.

Global Gag Rule

The debate on whether U.S. government should fund international family planning groups that provide abortions or related services has been brewing for decades. The "Mexico City Policy" that was signed into law by Ronald Reagan in 1984 was overturned by Bill Clinton in 1993 and restored by Bush in 2001. So, it was only a matter of time before the next Democratic president also rescinded his predecessor's rule.

Obama overturned the policy on Jan. 23, just days after he took the oath of office. "For the past eight years, [the restrictions] have undermined efforts to promote safe and effective voluntary family planning in developing countries," Obama said in a statement. Some international family planning groups hailed the decision, saying that Bush's ban discriminated against the world's poor by denying U.S. aid to groups that may be involved in abortion, but also work on other aspects of reproductive health care and HIV/AIDS. Obama's move was also met by criticism by Republicans and anti-abortion groups.

Provider Conscience Rule

Breaking with Bush on health care, Obama wants to give more power back to the patients on whether health care providers should provide controversial services. The administration revoked the Bush-era "Provider Conscience" rule that created more regulations to prevent those who refuse to hire doctors and nurses opposed to abortion rights from receiving federal funds. The move was applauded by abortion rights advocacy groups, who say the limits restricted patients' rights.

War Games

Stem Cell Research

In his latest rollback of Bush administration policies, President Obama signed an executive order Monday lifting the 7½-year ban on federal funding for embryonic stem cell research and a memorandum covering all scientific research. In a less-than-subtle criticism of Bush's ban, Obama said, "In recent years, when it comes to stem cell research, rather than furthering discovery, our government has forced what I believe is a false choice between sound science and moral values. In this case, I believe the two are not inconsistent," the president added before signing the order.

Obama said throughout his presidential campaign that he would overturn the ban if elected. President Bush banned federal funding for such research in August 2001, citing "moral concerns raised by the new frontier of human embryonic stem cell research. Even the most noble ends don't justify the means." Nearly six in ten Americans support loosening restrictions on federal funding of stem cell research. Proponents of stem cell research say Obama's order is a promising sign that progress can be made after a more-than-eight-year stalemate, while others say it is only a tiny step. Anti-abortion groups say the research is unethical and unreliable.

Global Gag Rule

The debate on whether U.S. government should fund international family planning groups that provide abortions or related services has been brewing for decades. The "Mexico City Policy" that was signed into law by Ronald Reagan in 1984 was overturned by Bill Clinton in 1993 and restored by Bush in 2001. So, it was only a matter of time before the next Democratic president also rescinded his predecessor's rule.

Obama overturned the policy on Jan. 23, just days after he took the oath of office. "For the past eight years, [the restrictions] have undermined efforts to promote safe and effective voluntary family planning in developing countries," Obama said in a statement. Some international family planning groups hailed the decision, saying that Bush's ban discriminated against the world's poor by denying U.S. aid to groups that may be involved in abortion, but also work on other aspects of reproductive health care and HIV/AIDS. Obama's move was also met by criticism by Republicans and anti-abortion groups.

Provider Conscience Rule

Breaking with Bush on health care, Obama wants to give more power back to the patients on whether health care providers should provide controversial services. The administration revoked the Bush-era "Provider Conscience" rule that created more regulations to prevent those who refuse to hire doctors and nurses opposed to abortion rights from receiving federal funds. The move was applauded by abortion rights advocacy groups, who say the limits restricted patients' rights.

War Games

Provider Conscience Rule

Breaking with Bush on health care, Obama wants to give more power back to the patients on whether health care providers should provide controversial services. The administration revoked the Bush-era "Provider Conscience" rule that created more regulations to prevent those who refuse to hire doctors and nurses opposed to abortion rights from receiving federal funds. The move was applauded by abortion rights advocacy groups, who say the limits restricted patients' rights.

War Games

During his presidential run, Obama promised to withdraw all U.S. combat troops within 16 months of taking office, but under his current plan, the number of 142,000 troops will be drawn down to 35,000-50,000 within 19 months. At the same time, Obama has committed more troops to Afghanistan, fulfilling the request from generals who want to step up the effort against a rising insurgency. Iraq, unsurprisingly, is one of the new administration's top agenda items. The president met with his close advisers on his first day in office to discuss the drawdown.

Defending John Yoo

But the Obama administration hasn't completely torn itself away from Bush's policies. The president's Justice Department is defending former Bush official John Yoo, so-called author of the "torture memo," and who is being sued by Jose Padilla, a suspected terrorist who says Yoo's memos on interrogation policies led to his detention and torture. "This administration has made no secret of the fact that it disagrees with the previous administration's approach to many legal issues in the national security arena," DOJ spokesman Matthew Miller said in a written statement defending the decision. "Nevertheless, the Department of Justice generally defends employees and former employees in lawsuits that are filed in connection to their official duties."

The 'State Secrets' Argument

The Obama administration also continues to uphold -- so far -- the controversial Bush-era "state secrets" argument. Holder said the few cases he has reviewed so far since taking over the reins at the DOJ show that the "invocation of the doctrine was correct."

The "state secrets" defense has been used in cases of rendition and torture and the first time Obama was put to test was when detainees tried to sue a Boeing subsidiary for its alleged participation in the CIA's rendition program. Holder argued in federal court in California that the case should be dismissed based on a "state secrets privilege" and because it would cause valuable national security issues to be revealed in open court. The ACLU lashed back at the administration, saying the president is not living up to his campaign promises and offers "more of the same." The Obama administration was tested again when the National Security Agency's wiretapping program came under scrutiny and once again officials invoked the same defense.

Energy and Environment Policies

Labor and International Laws

Labor Laws

Only ten days in office, Obama signed three executive orders that he said would "level the playing field" for labor unions and that would make unions easy to organize. Obama reversed a Bush order requiring federal contractors to post notice that workers can limit financial support of unions serving as their only bargaining representatives. Additionally, in undoing Bush's policies, Obama ordered that federal contractors offer jobs to current workers when contracts change and that federal contractors be prevented from being reimbursed for expenses meant to influence workers deciding whether to form a union and engage in collective bargaining. Obama's first law signed was also labor-related. The Equal Pay for Equal Work Bill was signed into law Jan. 29 and sought to end pay disparities between men and women.

Restrictions on Cuba

The president relaxed travel, commerce and mail restrictions on Cuba, allowing American-Cuban families unlimited visits to the island and no restrictions on the amount of remittances they can send back. The White House also plans to expand telecommunications networks that link the United States and Cuba, as well as export of humanitarian items. President Bush tightened restrictions on Cuba in 2004, which been under U.S. embargo since 1962. Leaders of Latin American countries are pushing the Obama administration to do away with the sanctions altogether. For his part, Obama has said he wants to open a dialogue with Cuba, but outlined a series of steps he first wants the government to take, including the release of prisoners. "I know there is a longer journey that must be traveled in overcoming decades of mistrust, but there are critical steps we can take toward a new day," the president said while attending the Summit of the Americas in April.

ABC News' Kate Barrett, Lindsey Ellerson, Karen Travers and Nitya Venkataraman contributed to this report