Michelle Obama mum on Biden-Harris 'dust-up,' withholding endorsement

Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaSanders v. Warren is just for insiders Overnight Health Care: Trump reportedly lashed out at health chief over polling | Justices to hear ObamaCare birth control case | Trump rolls back Michelle Obama school lunch rules Trump to roll back Michelle Obama's school lunch rules on vegetables, fruits MORE wouldn't comment during remarks on Saturday on the clash between Democratic White House hopefuls Joe BidenJoe BidenSanders joins Biden atop 2020 Democratic field: poll The Hill's Morning Report - Trump trial begins with clashes, concessions Trump says impeachment lawyers were 'really good' MORE and Sen. Kamala HarrisKamala Devi HarrisRep. Bobby Rush endorses Bloomberg's White House bid Actor Michael Douglas endorses Bloomberg for president Democrats: McConnell impeachment trial rules a 'cover-up,' 'national disgrace' MORE (Calif.) and stayed silent on backing one the two dozen candidates seeking the party's nomination. 

When asked by moderator Gayle KingGayle KingFlake: Republicans don't speak out against Trump 'because they want to keep their jobs' Lifetime to release sequel to 'Surviving R. Kelly' Bloomberg attacks Biden's experience: 'He's never been the manager of an organization' MORE at an Essence Festival on Saturday if she had a comment on the "dust up" between Harris and Biden, Obama simply replied "I do not." 

"I've been doing this rodeo far too long, and no comments," she said, according to a video shared by ABC News

Biden came under fire after Harris attacked his record on busing during the first Democratic debate. 

Obama on Saturday also did not endorse any candidate. 

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"Barack and I are going to support whoever wins the primary, our primary focus is letting the primary process play out," she said. 

Obama added that it's too early to predict who will become the party nominee. 

"It's like trying to figure out who's going to win the World Series on the first seven games, that's where we are right now. It's so early and things will change," she said. 

Obama said she and the former president are watching, supportive and offering advice to candidates who seek it. 

When King asked Obama to share what qualities she believed a president should have, she shot back: "I talked about this in the last campaign but nobody listened." 

"I was like, 'It's a hard job y’all.' Let's be clear, this isn't a joke. It's not a game," she said.

"The leader of the free world with a tweet can start war, can crush an economy, can change the future of our children," Obama added. "It is a real job that requires deep seriousness and focus, somebody who has to have enough understanding of history so that you don't repeat what hasn't worked."