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Cory Booker endorses Biden

Cory Booker endorses Biden

Sen. Cory BookerCory BookerBiden budget pick sparks battle with GOP Senate Policy center calls for new lawmakers to make diverse hires Dangerously fast slaughter speeds are putting animals, people at greater risk during COVID-19 crisis MORE (D-N.J.) announced his support for former Vice President Joe BidenJoe BidenGeraldo Rivera on Trump sowing election result doubts: 'Enough is enough now' Senate approves two energy regulators, completing panel Murkowski: Trump should concede White House race MORE's presidential campaign early Monday, adding to Biden's list of endorsements from his former primary opponents.

"The answer to hatred & division is to reignite our spirit of common purpose," Booker, who ended his own presidential campaign in January, said in a tweet.

"@JoeBiden won’t only win - he’ll show there's more that unites us than divides us," the senator said, adding that Biden will "restore honor to the Oval Office and tackle our most pressing challenges."

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"That’s why I’m proud to endorse Joe," he said.

Biden has added a slew of endorsements since an impressive showing on Super Tuesday last week, including one from Sen. Kamala HarrisKamala HarrisWho will replace Harris in Senate? 'Rising' discusses Wisconsin formally declares Biden won election following recount Moderate Democrats: Everyone's older siblings MORE (Calif.), another former rival for the Democratic presidential nomination.

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Sen. Amy KlobucharAmy KlobucharHillicon Valley: YouTube suspends OANN amid lawmaker pressure | Dems probe Facebook, Twitter over Georgia runoff | FCC reaffirms ZTE's national security risk Democrats urge YouTube to remove election misinformation, step up efforts ahead of Georgia runoff YouTube temporarily suspends OANN account after spreading coronavirus misinformation MORE (D-Minn.) and former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegJuan Williams: Clyburn is my choice as politician of the year 'Biff is president': Michael J. Fox says Trump has played on 'every worst instinct in mankind' Buttigieg: Denying Biden intelligence briefings is about protecting Trump's 'ego' MORE endorsed Biden after ending their 2020 campaigns shortly before Super Tuesday. The support from those fellow moderate candidates may have contributed to Biden’s surge in the 15 states in which ballots were cast last Tuesday. Biden himself credited Klobuchar for cinching his win in Minnesota.

Former Texas Rep. Beto O’Rourke (D) also endorsed Biden before Super Tuesday.

Sen. Elizabeth WarrenElizabeth WarrenBiden budget pick sparks battle with GOP Senate Warren, Brown voice support for controversial Biden budget office pick Biden's economic team gets mixed reviews from Senate Republicans MORE (D-Mass.), a progressive candidate who ended her campaign after Super Tuesday, has said she will not immediately endorse a candidate.

Biden holds a slight lead in delegates over Sen. Bernie SandersBernie SandersBiden budget pick sparks battle with GOP Senate Overnight Defense: Defense bill among Congress's year-end scramble | Iranian scientist's assassination adds hurdles to Biden's plan on nuclear deal | Navy scrapping USS Bonhomme Richard after fire Biden faces new Iran challenges after nuclear scientist killed MORE (I-Vt.). The two candidates will face off in six contests on Tuesday.

--Rebecca Klar contributed to this report, which was last updated at 7:52 a.m.