POLL EXCERPT POLL EXCERPT Do you believe the Second Amendment to the U.S. Constitution guarantees the rights of Americans to own guns, or does it only guarantee members of state militias such as National Guard units the right to own guns? Right of all Americans Only state militias All adults 73% 20% Gun owners 91% 6% Non-Gun owners 63% 28% Source: USA TODAY/Gallup Poll of 1,016 adults Feb. 8-10. Margin of error for all adults: ±3 percentage points; for gun owners: ±6 points; for non-gun owners: ±4 points; Julie Snider, USA TODAY KEY DATES IN DEBATE KEY DATES IN DEBATE -1993: Congress passes and President Clinton signs the Brady bill, which requires a five-day waiting period for those buying a handgun. The measure is named for former White House press secretary James Brady, who was shot during the assassination attempt on President Reagan in 1981. It's the first major gun-control legislation to clear Congress since 1968, the year Robert Kennedy and Martin Luther King Jr. were killed. -1994: Congress passes a 10-year ban on the manufacture and sale of certain semiautomatic assault weapons. -1995: After gaining control of Congress, Republican leaders in the House and Senate vow to repeal the assault weapons ban. -2000: Vice President Gore loses the presidential election. Many in his party cite his support of gun control as a factor. In 2004, the Democratic National Convention, for the first time, adds language to its platform backing a right to bear arms. -2001: President Bush's attorney general, John Ashcroft, declares the Second Amendment protects an individual right to own guns. The following year, Justice Department lawyers tell the Supreme Court that gun regulations should be subject to the highest level of judicial scrutiny, which would make it more difficult to enact such laws. -2004: Congress rejects renewal of the assault weapons ban. -2007: A federal appeals court strikes down a Washington, D.C., ban on handguns and declares that the Second Amendment "protects an individual right to keep and bear arms … for such activities as hunting and self-defense." -March 18, 2008: The Supreme Court is scheduled to hear D.C. officials' appeal of the federal court ruling. The White House says the Second Amendment protects an individual right to own guns but backs a judicial standard that would allow more firearms limits than its 2002 legal position would have. By Joan Biskupic WASHINGTON  Guns, and questions about how much power the government has to keep people from owning them, are at the core of one of the most divisive topics in American politics. Nowhere is that divide more pronounced than in the gap between Americans' beliefs about their rights under the Second Amendment, and how courts have interpreted the law. Nearly three out of four Americans — 73% — believe the Second Amendment spells out an individual right to own a firearm, according to a USA TODAY/Gallup Poll of 1,016 adults taken Feb. 8-10. Yet for decades, federal judges have seen the Constitution differently, allowing a range of gun-control measures imposed by governments seeking to curb gun violence. Lower court judges overwhelmingly have ruled that the right "to keep and bear arms" isn't for individuals, but instead applies to state militias, such as National Guard units. The U.S. Supreme Court repeatedly declined to hear appeals of those rulings, fueling the debate over gun control and tension between the law and public opinion. Now, in a benchmark case that arises against a backdrop of election-year politics, the high court will take its first definitive look at the Second Amendment. However the nine justices rule in the case, their decision will reshape the national debate over guns, a conflict that pits images of America's history of frontier liberty against concerns about public safety. "A Supreme Court decision has a moral, political and cultural meaning as well as a legal meaning," says Temple University law professor David Kairys, who has long been in the thick of the debate over gun rights and firearms violence as a defender of gun restrictions. "I think it is going to have a huge impact." The case tests the constitutionality of a handgun ban in Washington, D.C., where in 1976 officials imposed one of the nation's strictest gun-control laws in response to alarming levels of gun violence. The justices will hear arguments on March 18; a ruling is likely by the end of June. If the court decides there is an individual right to bear arms, it will be a huge victory for gun-rights advocates. It would reverse years of legal precedent and embolden politicians and groups such as the National Rifle Association (NRA) that have touted gun rights. It also likely would discourage new gun regulations and inspire challenges to other gun restrictions. The possibility that the D.C. dispute could jeopardize a range of federal firearms laws — including those banning individuals from owning machine guns and those establishing rules for transporting weapons — has led the Bush administration to take a step back from its strong support of gun rights. In 2001, the administration reversed decades of Justice Department positions when then-attorney general John Ashcroft said the Second Amendment did cover an individual right to have guns. Now, with the D.C. case before the Supreme Court, the administration isn't taking such a hard line on an individual right to own and use guns, a stance pushed by the NRA and its allies. Instead, the White House is urging the justices to adopt a legal standard that would protect an individual right to own guns but protect federal firearms laws. University of Texas law professor Sanford Levinson, who believes the Second Amendment provides a right to individual ownership, says the government's new position might be easier for the court to adopt. Many legal analysts predict that the court led by conservative Chief Justice John Roberts is ready to declare some individual right to own guns. Moderate conservative Justice Anthony Kennedy could be a key vote on the issue, as he has been for the past two years on the divided court. "My assumption is that there are at least five votes for the proposition that the Second Amendment protects an individual right," says Yale University law professor Jack Balkin. "But just because you say there is an individual right, you haven't resolved the case. … Is it an individual right to keep and bear arms that might be useful in militia service, a right to keep and bear arms that might be useful for self-defense, or both?" The shifting politics on guns Gun control was a recurring issue in the 1990s and deeply divided Democrats and Republicans, as Democrats typically favored strict controls on guns and Republicans stressed that people would be safer if they were allowed to arm themselves. That has changed somewhat. The Democratic and GOP candidates for president have differences on gun control, but Democrats are trying to appeal to those on each side of the debate. That's likely a reflection of Democratic leaders' attempts to move their party's stance on guns closer to that of most voters. Neither Hillary Clinton nor Barack Obama has focused on gun control in their campaigns for the Democratic nomination. When asked specifically about it in public forums, they voice modest support for new regulations and quickly add that the Second Amendment protects people's gun rights. "The Clinton and Obama campaigns know the public opinion data on the issue well," says Karlyn Bowman, a senior fellow specializing in public opinion polls at the American Enterprise Institute. "Opinion is complex, but the right to be able to own a gun seems to be firmly held, and I think that's why both candidates say what they say." At a debate in January, Clinton acknowledged that she had dropped her support for the licensing of new gun owners and registration of new guns, which she advocated in 2000 when she ran for the U.S. Senate in New York. She endorsed reinstating an assault-weapons ban, then added: "I believe in the Second Amendment. People have a right to bear arms. But I also believe that we can common-sensically approach this." Obama also said he no longer supported broad licensing and registering of firearms, as he did when he was in the Illinois Senate. "We essentially have two realities when it comes to guns in this country. You've got the tradition of lawful gun ownership. … And it is very important for many Americans to be able to hunt, fish, take their kids out, teach them how to shoot," he said. "And then you've got the reality of public school students who get shot down on the streets of Chicago." Republican frontrunner Sen. John McCain has needed no such finessing of the issue. He joined a congressional "friend of the court" brief in the D.C. case that vigorously endorses an individual right to have guns. Courts at odds with public The Second Amendment says, "A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed." Until recently, judges seized on the first part, the collective "militia" right, rather than the second clause, "the right of the people." The last time the Supreme Court took up a major gun-rights case was in 1939. That dispute, United States v. Miller, involved two men who were caught transporting an illegal sawed-off shotgun across state lines. The court did not directly address the scope of the Second Amendment. Yet its decision rested on the notion that the Second Amendment protects a collective right to firearms, not an individual right. In the years since, most lower federal courts interpreted the Miller decision to mean there was no individual right to have firearms. Last year, the U.S. Court of Appeals for the District of Columbia set the stage for the high court to weigh in when it ruled that the Second Amendment "protects an individual right to keep and bear arms … for such activities as hunting and self-defense." The appeals court invalidated D.C.'s ban on handguns in the home. Attorneys for Dick Anthony Heller, a security guard who wanted to keep a handgun in his Washington home for self-defense and who helped start the case, urged the justices to affirm that decision. Heller's attorneys note that in America's early days, colonists were bitter about the British king's disarmament of the English population. The attorneys say "the Second Amendment's text thus … confirms the people's right to arms." Lawyers for the D.C. government echo lower courts that have rejected such a notion: "The text and history of the Second Amendment conclusively refute the notion that it entitles individuals to have guns for their own private purposes." D.C. officials say they banned handguns because such weapons "are disproportionately linked to violent and deadly crime." The Bush administration's shifting stance on gun control has added political drama to the case. Ashcroft's position seven years ago made him a hero to the 4 million-member NRA, which put him on the cover of its monthly magazine and called him a "breath of fresh air to freedom-loving gun owners." The next year, in 2002, Justice Department lawyers said that any government regulation of gun rights should be subject to the highest level of judicial scrutiny, which would make it harder to enact gun laws. Now, the Bush administration is siding with Heller in a"friend of the court" brief — but with a large caveat. Justice Departmentlawyers have backed off their earlier position and now say gun regulation should be subjected to a lesser level of scrutiny that would allow far more regulation than the 2002 stance. The reason is explained in the first line of the administration's court brief: "Congress has enacted numerous laws regulating firearms." Current laws ban private ownership of machine guns and limit possession of firearms that can go undetected by metal detectors or X-ray machines. Laws also regulate the manufacture, sale and importation of firearms. Vice President Cheney, a hunting enthusiast, broke with the administration and signed a brief with a majority of the U.S. Senate and House of Representatives urging a high threshold for gun regulation. Levinson believes the Justice Department's stance could appeal to most of the high court as well as the public. "I think laws that pass with genuine public support are likely to be upheld," he says. Kairys, who has helped cities sue gunmakers for the costs of firearms violence, says gun-control laws could be hurt by any court finding of an individual right. If the court does that, he says, "It's going to be very hard to get any (gun control) legislation passed." Adds Balkin, "There is no reason to believe the court's decision will defuse the battle over guns. The court rarely has the last word in major social controversies. If the court rules for D.C., there will be continuing agitation by gun-rights advocates. If the court rules against D.C., there will be new waves of litigation" over what the ruling means. Enlarge By Dennis Cook, AP Attorney general John Aschroft in 2001 said Second Amendment covers an individual right to guns, reversing earlier Justice Department positions. Conversation guidelines: USA TODAY welcomes your thoughts, stories and information related to this article. Please stay on topic and be respectful of others. Keep the conversation appropriate for interested readers across the map.