Sen. 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 his surrogates are launching a 4-day campaign swing through Iowa ahead of the state's first-in-the-nation caucus in less than two weeks.

Sanders's campaign announced Thursday that the senator would join top campaign surrogates 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.) and filmmaker Michael Moore at a rally in Ames on Saturday night featuring rock group Portugal. The Man.

The candidate will then join other surrogates at events on Sunday as part of the campaign's multiday barnstorm of the Hawkeye State culminating in a Sunday night event at the Sioux City Convention Center.

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Sanders has been in Washington, D.C., during the past several days for the start of the Senate's impeachment trial of 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, which requires senators to be in attendance during the day six days a week.

Sanders's campaign was forced to cancel a rally it had scheduled earlier this week due to the trial.

Rep. Mark Pocan Mark William PocanClark rolls out endorsements in assistant Speaker race Hillicon Valley: Pentagon reaffirms decision to award JEDI contract to Microsoft | Schiff asks officials for briefing on election security threats Democrats explore new ways to resurrect election security briefings MORE (D-Wis.), a co-chairman of the Congressional Progressive Caucus who recently endorsed Sanders alongside another key House progressive, Rep. Pramila Jayapal Pramila JayapalDHS opens probe into allegations at Georgia ICE facility Progressive Caucus co-chair: Whistleblower complaint raises questions about 'entire detention system' Buttigieg, former officials added to Biden's transition team MORE (D-Wash.), is also expected to join the senator and others on Saturday for a town hall in Cedar Falls, according to his campaign.

Sanders remains near the top of most polls of Iowa and on top of the pack in New Hampshire, which will hold its primary Feb. 11, a week after the Iowa caucuses. Sanders is battling other top-polling candidates in the Granite State including 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 (D) 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 (D).

A national poll of the Democratic field released by CNN on Wednesday found Sanders as the top pick among Democrats, with Biden trailing by just 3 points, while Buttigieg and Sen. 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.) have seen their support drop in recent weeks.

The campaign swing this weekend is Pocan's first time joining Sanders on the trail, while both Ocasio-Cortez and Moore have stumped for Sanders on the road before. Ocasio-Cortez endorsed Sanders last year following his heart attack and also volunteered on his 2016 campaign.