Former U.S. Ambassador to the United Nations Samantha Power Samantha Jane PowerSupport swells for renaming Edmund Pettus Bridge in Selma to honor John Lewis after his death 'Obamagate' backfires: Documents show Biden, Obama acted properly 'Unmaskings' may be common — and that's the problem MORE on Super Tuesday 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, praising what she called his “empathy and decency.”

Power, a professor at Harvard Kennedy School and a Massachusetts resident, tweeted Tuesday that she had voted for Biden despite policies she admired from 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.) and former New York City Mayor 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.

“The foundations of a progressive policy platform are empathy and decency, which @JoeBiden embodies to a truly rare extent,” Power tweeted Tuesday. “These qualities are also the antithesis of the narcissism and cruelty of @realDonaldTrump. The contrast will be stark.”

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The foundations of a progressive policy platform are empathy and decency, which @JoeBiden embodies to a truly rare extent. These qualities are also the antithesis of the narcissism and cruelty of @realDonaldTrump. The contrast will be stark. — Samantha Power (@SamanthaJPower) March 3, 2020

"@JoeBiden is running not to go back in time or to 'unite' w/ a @GOP that now cares more about itself than the country," she added. "He is running to bring America to a place where we care for one another, where everyone is seen and included & where government has your back when you stumble."

.@JoeBiden is running not to go back in time or to “unite” w/ a @GOP that now cares more about itself than the country. He is running to bring America to a place where we care for one another, where everyone is seen and included & where government has your back when you stumble. — Samantha Power (@SamanthaJPower) March 3, 2020

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Power went on to recount learning that Biden gave out his personal cellphone number to people he met who had suffered “great personal loss.”

Power, who served as ambassador from 2013 to 2017, is the latest of several Obama administration officials to endorse the former vice president, including former White House chief of staff Denis McDonough Denis Richard McDonoughThe swamp wasn't drained — it expanded Susan Rice calls for Flynn-Kislyak transcripts to be released GOP seeks to go on offense using Flynn against Biden MORE and former national security adviser Susan Rice.

Biden also secured the endorsements of several former competitors for the Democratic nomination ahead of the Super Tuesday primaries, including 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.), 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 former Rep. Beto O’Rourke (D-Texas).