In 2016, probably, as the nominee will likely be Clinton or Biden. After that, I strongly doubt it. By the 2020s gay marriage will be fairly widely accepted, with only the last bastions of hateful fundamentalist intolerance in the South still opposed to it.
Called it
Uhm, no? Hillary Clinton (and Joe Biden for good measure) supported gay marriage by 2016
I meant that Lief predicted the two subsequent Dem nominees all the way back in 2009.
Given, a Clinton ticket seemed like an eventuality at the time, but even in the correct order is pretty impressive.