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.) and former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) stopped in Wisconsin this weekend to underscore the Democratic Party's push in the Midwest as the 2020 presidential campaign gets into full swing.

Klobuchar made Wisconsin her first stop since announcing her candidacy last Sunday in Minneapolis.

"I want to build on the momentum that we saw here in 2018," Klobuchar told reporters Saturday, according to CNN. "No one ever thought that the Democrats were going to be able [to defeat] Gov. Walker, but we did it, and we did it in a smart, Wisconsin way with a grass-roots campaign with [Democratic Sen.] Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE at the top of the ticket, and we can do it in the presidential, as well."

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Klobuchar added that she planned to campaign in places "that maybe we didn't focus on enough in the last few years," CNN reported. The comment mirrored a veiled critique of 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's 2016 campaign that Klobuchar made upon her announcement.

O'Rourke, meanwhile, who has not yet announced whether he'll launch a presidential campaign, stopped at two colleges in Wisconsin.

"I want to make sure that I'm listening to everyone — not just those that I know in El Paso and in Texas, but everyone, including going to places that are forgotten or overlooked or have not been visited enough or are only thought about in calculations as you accumulate electoral votes or you think about the next election," O'Rourke reportedly told supporters on Friday, according to CNN.

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 won Wisconsin in the 2016 election, beating Clinton by less than 23,000 votes. The state had gone to the Democratic presidential candidate in each of the seven elections prior.

Klobuchar is one of roughly a dozen Democrats to either declare their candidacy for president or form an exploratory committee. She joins Sens. 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 (Mass.), 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 (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 (N.Y.) 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 (Calif.), among others.

O'Rourke is one of several figures mulling a Democratic presidential bid. Among those expected to enter the field are former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE and Sen. 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.).