You're missing the point. Who I choose is a lot less important than whether the eventually nominee can win the general election. This kind of stupidity on Trump's part does not help that cause, but he seems unable to stop himself.
Your real beef is that despite all the stupidity Cruz can't stop him either.
It is not that Trump is truly popular it is all the others are very unpopular and that includes Cruz the Constitutionalist.
It doesn't matter much what his views on the constitution are because all those issue are usually decided by one left wing nut on the Court, like the one today.
I agree. Trump has disappointed in many ways.
This kind of stupidity on Trump’s part does not help that cause, but he seems unable to stop himself.
Unlikely he will quit if he wins the nomination.
And not only is Hillary, assuming she’s the nominee, is counting on it she’s hoping for it.