Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) won the presidential endorsement of the former Iowa chairwoman of Sen. Kamala Harris Kamala HarrisNational postal mail handlers union endorses Biden The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Jim Carrey to play Biden on 'Saturday Night Live' MORE’s (D-Calif.) failed White House bid just hours before the state’s caucuses.

Deidre DeJear, who helped run Harris’s operations in the Hawkeye State before the California senator pulled out of the race, said she would caucus for Warren because of her commitment to “justice.”

“You know, I was originally endorsing Sen. Kamala Harris, and after she left the race, I was really looking for someone who’s going to be fearless and committed to justice for all people, not just some,” DeJear said in a video circulated by Warren’s campaign.

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“We understand there’s this notion that a rising tide lifts all boats. And in that rising tide, there’s people who don’t have boats and there’s people with holes in their boats,” she added. “And Sen. Warren is one of those individuals that’s looking at, as people are rising, who’s not?”

It's time, Iowa. The caucuses are tonight and @DeidreDeJear is all in for @ewarren. pic.twitter.com/JUNcQzzS82 — Iowa for Warren • Text IOWA to 24477 (@IAforWarren) February 3, 2020

DeJear went on to cite Warren’s economic plans, many of which seek to raise taxes on the wealthiest Americans to close income and other financial gaps in the country.

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“I have no doubt in my mind that she is going to add so much value to each and every one of our individual households,” she said.

DeJear’s endorsement of Warren came just hours before Iowa caucusgoers began declaring who they would support in the state’s nominating contest.

Warren’s poll numbers have dipped in recent months in Iowa, with surveys showing her behind former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE and Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.), though she remains within striking distance.

In the lead-up to Iowa’s caucuses, Warren’s campaign has sought to cast the Massachusetts senator as a potential Democratic unifier who can bring together the centrist and progressive flanks of the party.

“More so than anything, one thing that she’s committed to doing is uniting us together because we have a big stumbling block ahead of us, and his name is Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE,” said DeJear. “And it’s not something that is very, very difficult for us to get over, but she also understands that we are stronger together in getting over this hump.”

DeJear was the Democratic nominee for Iowa’s secretary of state in 2018, becoming the first black candidate to win a major party nomination for a statewide office in the Hawkeye State, though she eventually lost the general election.