President Trump decides not to run for re-election.
Republicans nominate Vice-President Pence, and he selects UN Ambassador Nikki Haley as his running mate.
Democrats have a competitive Primary, but they ultimately nominate Elizabeth Warren, who selects Beto O'Rourke as her running mate (for this scenario, assume O'Rourke defeats Ted Cruz in 2018).
Who wins and why (maps included, please)?
A Beto O'Rourke/Liz Warren ticket would win in a landslide, but the opposite ticket would probably only win by Obama '12 margins.
