Among top potential contenders, Michigan Gov. Gretchen Whitmer has said she won't run, and California Gov. Gavin Newsom has said he would back Harris if she became the nominee.
Democrats rally around Kamala Harris as she vows to 'earn and win' party nomination for president
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"I'm a co-chair of the Biden-Harris campaign. I'm working my tail off to make sure that we're successful. I've done travel, I've done a ton of work here in Michigan, and we're going to do that," she said. "So I feel like it actually undermines the work that I'm putting in on behalf of the administration. So I don't like seeing it because I don't want to talk about that stuff."
Biden's tight schedule rattles his public appearance, contends Gov. Whitmer
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