Suppose in an alternate universe, you have a different nominee from one party. Who do you think they would/should pick as a running mate?
For the Democrats:
Suppose it’s Biden vs. Trump, who does Biden run with?
Sanders vs. Trump, who does Sanders pick?
O’Malley vs. Trump, who does O’Malley pick?
On the Republican side:
Cruz vs. Clinton, who does Cruz pick?
Kasich vs. Clinton, who does Kasich pick?
Bush vs. Clinton, who does Bush pick?
Biden vs Trump: I say Biden goes with Warren.
Sanders vs Trump: Sanders goes with Warren. Although I’d like to see him pick a retired general or someone like Tim Kaine.
O’Malley vs. Trump: I’d like to see Tom Perez, but really I have no idea.
Cruz vs Clinton: Cruz goes with Carson
Kasich vs. Clinton: Kasich goes with Rubio to appeal to Latinos and Florida
Bush vs. Clinton: Bush goes with Kasich-- that would lock up Florida and Ohio, plus even though Bush is part of the Bush dynasty, having two governors on the ticket would allow them to campaign as DC outsiders.