Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE's presidential campaign on Friday announced endorsements from half a dozen mayors in Iowa.

Ahead of the first-in-the-nation caucuses, the campaign announced a total of 10 new endorsements in a statement, including six current mayors, a former mayor, two city council members and a sheriff.

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“Iowans know that Joe Biden is the strongest candidate to beat Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE next November, and that’s why leaders from across the state are coming forward to proudly show their support,” the campaign's Iowa state director, Jake Braun, said in a statement.

“From standing up for the middle class to combating climate change, Joe has a proven record of turning progressive ideas into real results that Iowans and Iowa leaders are excited about.”

The endorsements come as Biden has consistently polled at the top of the crowded Democratic field nationally, but has struggled in recent Iowa polls.

Polling aggregate site RealClearPolitics puts him in fourth in the early caucus state, trailing Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D) and Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.). The site has Biden in first place in national polls.

Biden has defended his standing in the state, saying he plans on "doing very well."

The Iowa caucuses, the first 2020 nomination contest, will take place on Feb. 3.