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’s (I-Vt.) campaign said it had attracted large crowds to its rallies in Iowa featuring Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.) over the weekend.

Sanders is mired in a four-way race in Iowa; according to the latest Quinnipiac University survey, he is statistically tied with 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 and 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.

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Sanders estimated more than 6,500 people joined him and Ocasio-Cortez at three events in Iowa over Friday and Saturday, the first time the two have campaigned together in the state.

“Woah! In just 24 hours, over 6,500 people joined us in Coralville, in Council Bluffs and for our Climate Crisis Summit in Des Moines,” he tweeted Sunday. “We are going to win because we are bringing working people, young people and poor people across Iowa and this nation into the political process.”

Woah! In just 24 hours, over 6,500 people joined us in Coralville, in Council Bluffs and for our Climate Crisis Summit in Des Moines.



We are going to win because we are bringing working people, young people and poor people across Iowa and this nation into the political process. pic.twitter.com/WuZeDL8IEz — Bernie Sanders (@BernieSanders) November 10, 2019

Sanders's tweet came after his Iowa deputy state director, Bill Neidhardt, tweeted that more than 2,400 people came to a rally held by the two progressive firebrands in Council Bluffs on Friday, calling it "the largest rally in Iowa of any candidate."

You're looking at the largest rally in Iowa of any candidate. @BernieSanders and @AOC brought together over 2,400 people in Council Bluffs tonight. pic.twitter.com/PuciQIKbPJ — Bill Neidhardt (@BNeidhardt) November 8, 2019

Neidhardt also estimated that more than 2,000 people attended rallies in Coralville and Des Moines.

During her first visit to Iowa of the 2020 cycle, Ocasio-Cortez also knocked on doors and spoke to Iowa voters. She tweeted that it gave her "an understanding of how people are thinking about issues."

Many people are surprised to learn that I still knock doors almost everywhere I go ☺️ It’s how I get to know people & communities!



This morning I knocked some doors in Iowa before our @BernieSanders Climate Summit to get an understanding of how people are thinking about issues. https://t.co/fzRaX1fMSH — Alexandria Ocasio-Cortez (@AOC) November 9, 2019

Ocasio-Cortez, the firebrand freshman who ousted a longtime Democratic incumbent last year, formally endorsed Sanders in the 2020 race during a rally in her Queens district. Sanders estimated then that more than 25,000 people attended the New York rally.

The campaign later released a 30-second digital spot in Iowa touting the rising progressive star’s endorsement.