Who will be the running mates?

[Crossless2.0]

I don't think Trump's winning the nomination is even remotely a foregone conclusion. The party machine will pull out all the stops to prevent that, including a brokered convention if it comes down to crunch time.

What makes you so confident in this?

He's too divisive to appeal to more than a segment of the population, and any number of establishment Republicans are already on record, saying he is a demagogue and an embarrassment to the party. They will discredit him any way they can (which might take some doing, considering how thoroughly he has discredited himself without somehow destroying his own prospects). The GOP may be on its last legs, and the past two elections have demonstrated to the few bright bulbs still left in the party that they really can't win nationally without strong appeal with women and Hispanic voters. Do you seriously think Trump will perform well with either group? Do you think he is likely to fire up the Christian social conservatives to get to the polls to vote for him? True, that group can probably be counted on to show up to vote against Clinton, but that's not guaranteed and hardly counts as an endorsement of Trump.

What I see happening is a shoring up of supporters in now defunct campaigns (some to Cruz, some to Rubio and damned few to Trump) in the coming days and weeks. Meanwhile, the establishment will wait this out until the primaries become winner-take-all-delegates affairs; then watch the PAC money start raining! I'll be surprised if Trump staggers into the convention with a lead.