Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) on Sunday announced that she’s running for president in 2020, becoming the fifth U.S. senator to jump into the race to defeat President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE.

Standing on a snow-covered stage in Boom Island Park in Minneapolis, where the temperatures had dipped to a freezing 14 degrees, Klobuchar announced her candidacy while invoking her family's deep roots in the Midwest, a key battleground for Democrats as they look to rebuild their blue wall in Michigan, Wisconsin and Pennsylvania.

“Today on an island in the middle of the mighty Mississippi … I stand before you as the granddaughter of an iron ore miner, as the daughter of a teacher and a newspaperman, as the first woman elected to the United States Senate from the state of Minnesota, to announce my candidacy for president of the United States," Klobuchar announced to a cheering crowd of onlookers.

The three-term senator laid out her vision for the country in a number of policy areas. She pledged to "take on the gun lobby," root out corporate money in politics, commit to environmentally friendly policies, lower health care costs, restore voting rights and implement privacy protection laws.

She did not mention Trump by name, but alluded to him when she declared the country deserved better than "foreign policy by tweet."

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"Our sense of community is fracturing across our nation, worn down by the petty and vicious nature of our politics," she said. "We are tired of the shutdowns and the showdowns, of the gridlock and the grandstanding. Today, on this snowy island, we say enough is enough."

With her announcement, Klobuchar also became the second presidential candidate to hail from the Midwest.

Klobuchar has been considering a presidential campaign and was seen as signaling a likely bid when reports came out that she’ll be headlining a local Democratic banquet in Iowa on Feb. 21.

She joins a crowded field seeking the Democratic nomination in 2020, including Sens. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.), Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) and Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.).

Other senators are still weighing 2020 bids including Sens. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), a progressive stalwart, and Sherrod Brown Sherrod Campbell BrownSenate Democrats release report alleging Trump admin undermined fair housing policies Bipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda MORE (D-Ohio), who is also touting his Rust Belt roots.

South Bend, Ind., Mayor Pete Buttigieg (D) has also announced his intention to seek the presidency and has made his ties to the Midwest a central part of his campaign.

The Democratic field for 2020 is expected to be the biggest in history — and its most diverse — reflecting a party base eager to oust Trump, but one that remains wide open as the Democratic Party continues to move farther to the left.

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In 2018, Klobuchar cruised to win a third Senate term, despite Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE barely winning Minnesota just two years earlier.

Klobuchar is expected to lean into her heartland roots and have a mild-mannered campaign approach that many dub "Minnesota nice."

“I don’t agree with, ‘When they go low, we go low,’ but I do agree that when they go low, we have to respond,” Klobuchar told The New York Times in November. She was referring to an ongoing debate among Democrats, sparked by former first lady Michelle Obama Michelle LeVaughn Robinson ObamaMichelle Obama: 'Don't listen to people who will say that somehow voting is rigged' Michelle Obama and Jennifer Lopez exchange Ginsburg memories Social media platforms put muscle into National Voter Registration Day MORE’s “When they go low, we go high” speech from the 2016 presidential election, about how to acknowledge Republican attacks.

“But responding doesn’t mean just going down a rabbit hole everywhere Donald Trump goes," she continued. "It means doing a response but continuing to push your own agenda. I don’t think we want to use those same tactics and tweet caustic comments every morning.”

Klobuchar began 2019 with $3.9 million in her Senate campaign account, according to the most recent Federal Election Commission filings.

While she can transfer that money to her presidential campaign, Klobuchar goes in a bit behind Warren and Gillibrand, who each have north of $10 million.

Klobuchar’s nascent campaign will need to overcome some recent negative headlines about her treatment of staffers.

HuffPost reported that three potential candidates to lead her presidential campaign declined the job, citing the mistreatment of staff.

And BuzzFeed followed up with a story about former staffers complaining about Klobuchar’s temper, accusing her of throwing papers and sending humiliating emails.

Still, several staff defended Klobuchar in the BuzzFeed report, describing her as a thoughtful and caring boss.

In her campaign announcement on Sunday, Klobuchar vowed to supporters she would be a no-nonsense president who would "lead from the heart."

"As your president, I will look you in the eye," she said. "I will tell you what I think. I will focus on getting things done."