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

Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama weighs in on Trump, 'Squad' feud: 'Not my America or your America. It's our America' Poll: Michelle Obama most admired woman in the world Former Michelle Obama aide calls for 'honest conversation' about immigration MORE wouldn't comment during remarks on Saturday on the clash between Democratic White House hopefuls Joe BidenJoe BidenUkrainian officials and Giuliani are sharing back-channel campaign information: report The Hill's Morning Report — Mueller Time: Dems, GOP ready questions for high-stakes testimony Biden campaign taps foreign policy vet Nicholas Burns as adviser: report MORE and Sen. Kamala HarrisKamala Devi HarrisThe Hill's Morning Report — Mueller Time: Dems, GOP ready questions for high-stakes testimony Biden's lead narrows in early voting states: poll New CBS poll shows Biden with 7-point lead in New Hampshire MORE (Calif.) and stayed silent on backing one the two dozen candidates seeking the party's nomination. 

When asked by moderator Gayle KingGayle KingCBS's Gayle King asks Pressley whether calling Trump 'occupant' of the Oval Office is respectful The Hill's Morning Report - A raucous debate on race ends with Trump admonishment The Obamas' silence on Joe Biden is deafening  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."