Former national security adviser and U.N. Ambassador Susan Rice on Monday endorsed 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.

Rice, who served in the Obama administration, tweeted her support for Biden as endorsements for the former vice president flooded in one day ahead of the crucial Super Tuesday races.

Like many Biden endorsements, Rice's highlighted the candidate's years of experience.

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But it also focused on another trait Rice said will make Biden a good leader: his empathy.

“I'm proud to endorse @JoeBiden for President. Here he is comforting me on 1/4/17 just after my mother passed away,” Rice tweeted with a picture of the two hugging. “There is no one kinder, more empathetic and caring than @joebiden. He will lead America with the same deep compassion and decency.”

I worked very closely with @JoeBiden for 8 years. He is smart, strategic and more experienced than any candidate in the field. No one is better prepared and more trusted by our allies to repair the incalculable damage Trump has done to our int'l standing and national security. — Susan Rice (@AmbassadorRice) March 2, 2020

She also said Biden is the best chance for Democrats to defeat Trump, win the Senate and maintain the majority in the House.

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“Above all, @JoeBiden is a Democrat and the strongest candidate to take on and defeat Trump. That's why Trump is so scared of Biden. Our fate as a nation depends on beating Trump. Nothing is more important, and now is not the time for risky bets or divisive revolutions,” she tweeted.

With @JoeBiden as our nominee, we have the best chance to expand the Democrats' majority in the House and take back the Senate -- so we can finally get stuff done. Every day, he will put the national interest above his personal interest. Please join me in supporting @JoeBiden. — Susan Rice (@AmbassadorRice) March 2, 2020

Biden received a wave of endorsements Monday, including from former Senate Majority Leader Harry Reid Harry Mason ReidSenate Republicans signal openness to working with Biden Mellman: The likely voter sham Bottom line MORE (D-Nev.), that could help give him a needed boost heading into Super Tuesday.

Two candidates in Biden’s moderate lane, former South Bend Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE and Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.), dropped out of the race and are set to endorse Biden.

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.) is heading into Super Tuesday as the leading candidate in pledged delegates, with Biden in second.

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.), Michael Bloomberg Michael BloombergThe Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support MORE and Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) are also running in Tuesday’s 15 races.