Byron York: Why can't Trump just release Ryan from his endorsement?

It’s more than obvious that the marriage of Donald Trump and leading Republicans isn’t working. And it’s not just Paul Ryan— Reince Priebus, Mitch McConnell and other top GOP officials are obviously uncomfortable with Trump.

The fact is, Barack Obama made a perceptive and hard-to-refute point when he said of Republican leaders on Tuesday, “The question I think that they have to ask themselves is, if you are repeatedly having to say in very strong terms that what [Trump] said is unacceptable, why are you still endorsing him?”