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The field of potential Democratic candidates is crowded, while no Republican has emerged so far as likely to challenge President Donald Trump.
As the contenders emerge, Democrats will be considering the lessons from the midterm's victories, losses, and surprises.
The record number of women elected to Congress - as well as polling that shows all of the most likely women to run would beat Trump - will also be on Democrats' minds.
Here are the most likely 2020 presidential contenders.