Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE will hit the campaign trail in Iowa with three swing district Democrats in a bid to win over moderates in the crucial early caucus state.

Biden will go on tour this weekend with freshman Reps. Abby Finkenauer Abby Lea FinkenauerTrump asked Chamber of Commerce to reconsider Democratic endorsements: report House Democrats' campaign arm reserves .6M in ads in competitive districts GOP leader says he doesn't want Chamber's endorsement: 'They have sold out' MORE (Iowa), Chrissy Houlahan (Pa.) and Colin Allred (Texas), all of whom flipped GOP-held districts in the 2018 midterms and helped the Democrats retake the House.

The tour will send the four to Cedar Rapids, Oelwein, Waukon, Decorah, Waverly and Marshalltown over a two-day period, a rapid clip reflecting the full-court press Biden is making to win the support of Iowa voters ahead of the Feb. 3 caucuses.

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“The Members of Congress will highlight the imperative that Democrats select a nominee that will not only ensure we beat Donald Trump, but also help the party win up and down the ticket next November in battleground districts and states,” Biden’s campaign said in a statement.

Biden has put his electability at the center of his campaign, arguing that a moderate is best suited to defeat President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE in swing states in November.

Polling shows a tightly packed top tier in Iowa, with the RealClearPolitics average showing Biden with a slim lead over Sens. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE.

Sanders and Warren, who are stuck in Washington during the week for the Senate’s impeachment trial, are dispatching their top surrogates to Iowa to maintain their campaign’s presence in the Hawkeye State.

Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezLawmakers fear voter backlash over failure to reach COVID-19 relief deal Why Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' MORE (D-N.Y.), a progressive with wide name recognition, will tour the state for Sanders, while former Housing and Urban Development Secretary Julián Castro, who scrapped his own presidential bid before endorsing Warren, is holding multiple events for the Massachusetts senator.