How do you do that while retaining the loyalty of Cruz and Trump supporters, who constitute the vast majority of Republicans who have voted in the primaries?
You can't, so forget it. I will vote for any mangy mutt the GOPe nominates, even if it's not Cruz or Trump. But don't mistake that grudging effort for an endorsement. If the GOPe cheats the voters at the convention their chosen chump will lose the general election, barring some absolutely unprecedented bungling by Hillary or Bernie.
I disagree that "You can't, so forget it."
The answer is for those of us with the longer view to ratchet up our disapproval of the NeverTrump and NeverCruz minorities. If either of these groups stays home in November, then Hillary wins.
I would like to believe that most of those two groups would, in fact, support the Republican in November over Hillary or Bernie. Certainly some will.
But their intranisigence now is costing us. If it is true that they would support Hillary over Cruz or Hillary over Trump, then I think they are in the wrong place and should have discussions with Bernie supporters on some other forum. As long as those people are here, then the focus of the rest of us should be to help them understand the stakes and get them to commit to keeping Hillary or Bernie out of the White House.
Is there anyone on this forum who believes that the Democrats are better off having Bernie challenging Clinton? With any luck they will each eventually destroy the other. We should learn from their experience and avoid that.