Some major filing deadlines have already passed. I’m not sure about IA and NH, but California’s filing deadline was December 6. Illinois was December 2. Maybe she can recruit some uncommitted delegates, but getting people to vote for them is a lot harder than getting a delegate committed to your candidacy elected/appointed.
Her only chance is to hope for a deadlocked convention if she wants to be the nominee.
Some major filing deadlines have already passed.
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Means nothing. No deadlines, rules or laws apply to Democrats.