Cory Booker, because the best way to mooch some of that Obama mojo is picking someone who many Americans think is the same dude.
Before being picked, as opposed to Shriver who was afflicted afterwards.
Then there’s the ever popular “Toughen the Kid Up by Giving Him a Taste of Satan” move, leading to Dick Cheney.
Bernie Sanders because otherwise his legion of supporters will evaporate like pixie dust in a hard rain.
Elizabeth Warren, although having two people of the same sex on a single ticket would be unprecedented.