Former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE called Wednesday's fiery Democratic primary debate "something of a food fight," though he praised former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE for "staying above the fray."



"I thought the debate overall was something of a food fight among a lot of candidates except Joe Biden," Kerry told CNN host John Berman in an interview on Thursday. "I think Joe Biden managed to stay above that fray."



Kerry endorsed Biden in December and has campaigned for the former vice president.

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During the CNN interview, Kerry commended Biden for addressing the concerns of working-class voters, as well as for his policy proposals including on infrastructure and for not putting "things on the table that are not possible to achieve."

Kerry added that Biden has the potential to win battleground states in the general election.

"I know what it's like to win the nomination," Kerry said, citing his wins in Wisconsin, Michigan and Pennsylvania in his failed 2004 challenge against former President George W. Bush.

"I know Joe Biden is best positioned to be able to win those states to win the presidency," he added, referring to three states that were widely seen as having handed President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE the White House in 2016.

Kerry also said Biden is poised to provide "coattails" for congressional candidates across the country.

"He also is the only candidate in the field who is invited by congressional candidates in very difficult districts in America to go campaign for them," Kerry said.

Biden was seen as one of the top front-runners in the 2020 Democratic race, but has slid in the polls after poor performances in Iowa and New Hampshire.