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- Sen. Joe Manchin rules out presidential bid, will not challenge VP Kamala Harris.
- But Manchin, now an Independent, said he believes Democrats' rapid support for Harris is a mistake.
- He wants a competitive primary process, but Harris is fast becoming the consensus candidate.
Sen. Joe Manchin of Virginia, who briefly sparked fears among Democrats that he could re-register as a Democrat and challenge Vice President Kamala Harris for the presidential nomination, has ruled out running.