Former Sen. Barbara Boxer Barbara Levy BoxerThe Hill's Morning Report - Presented by Facebook - Biden, Harris launch Trump offensive in first joint appearance Bottom line Polls show big bounce to Biden ahead of Super Tuesday MORE (D-Calif.) on Sunday announced her endorsement of 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 for president following his double-digit victory in the South Carolina primary, the campaign announced.

“To defeat the most polarizing and dangerous president in modern history, we need a candidate who unites us, cares about us, and knows how to get things done. Like all of us, Joe has been knocked down. Hard,” Boxer said in a statement.

“He always gets up and he always finds the beauty, the promise and the hope that lives in every corner of this country we all love. His record proves he understands the values of America,” she added.

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Boxer, who retired in 2017, goes on to cite Biden’s spearheading of the Violence Against Women Act and the renewal of the Voting Rights Act and his work as President Obama's vice president to shepherd the Affordable Care Act through Congress.

“Joe wants to continue to make life better for all of us and he knows how to stand up to bullies,” Boxer wrote. “Because of that he can win a broad election victory including in the swing states we must win.”

The Biden campaign has received numerous endorsements from California Democrats ahead of the Golden State’s Super Tuesday primary, including Los Angeles Mayor Eric Garcetti, Sen. Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE and Rep. Lou Correa Jose (Lou) Luis CorreaCriminalization that never should have been: Cannabis Man arrested, charged with threatening to attack Muslims in Germany Gloves come off as Democrats fight for House seat in California MORE. However, most polling shows Biden's main primary rival, 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.), with a comfortable lead in the state.

The RealClearPolitics average of polls shows Sanders with a more than 15-point lead over Biden, 34.8 percent to 18 percent, just ahead of Tuesday's vote.