2. Roy Cooper
Cooper served as the 49th attorney general of North Carolina for a considerable amount of time, from 2001 to 2017, before (reluctantly if the reports are to be believed) running for governor of North Carolina and defeating incumbent Republican Pat McCrory. In true modern Republican parlance, McCrory of course cried foul, claiming the election had been manipulated by voter fraud. When the recount was finished, Cooper had won by even more.
His apparent hesitance to run for governor might be an indicator that he is not quite ready to take that next step toward the Presidency. Democratic strategists seem to think otherwise as they are pushing him as a candidate who knows how to win. Cooper has consistently and repeatedly secured victory in a state carried by Republican presidential nominees, including in the same election.