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TAMPA, Fla. (WFLA) — With Sunday’s announcement by President Joe Biden that he will be ending his re-election campaign, speculation swirled over who will be the new Democratic nominee.

Several names have been floated, including Vice President Kamala Harris — who received Biden’s endorsement. Other names being tossed around are Michigan Gov. Gretchen Whitmer, Kentucky Gov. Andy Beshear, North Carolina Gov. Roy Cooper, and California Gov. Gavin Newsom.

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Biden’s decision came as he has been isolating at his Delaware beach house after being diagnosed with COVID-19 last week, huddling with a shrinking circle of close confidants and family members about his political future. Biden said he would address the nation later this week to provide “detail” about his decision.

Senior campaign and White House staff were notified just minutes before the letter went out, according to people familiar with the matter. Biden had been reflecting on his future for the past couple days and the decision was closely held.

The White House confirmed the authenticity of the letter.

The decision marks a swift and stunning end to Biden’s 52 years in electoral politics, as donors, lawmakers and even aides expressed to him their doubts that he could convince voters that he could plausibly handle the job for another four years.

Biden won the vast majority of delegates and every nominating contest but one , which would have made his nomination a formality. Now that he has dropped out, those delegates will be free to support another candidate .

Harris, 59, appeared to be the natural successor, in large part because she is the only candidate who can directly tap into the Biden campaign’s war chest, according to federal campaign finance rules.

Biden’s backing helps clear the way for Harris, but a smooth transition is by no means assured.

If Kamala Harris were the next nominee, it would be up in the air who her running mate would be.

The Democratic National Convention is scheduled to be held Aug. 19-22 in Chicago, but the party had announced that it would hold a virtual roll call to formally nominate Biden before in-person proceedings begin.

It remained to be seen whether other candidates would challenge Harris for the nomination or how party may need to adjust its rules again to smooth Harris’ nomination on the floor.

The Associated Press contributed to this report.

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