Yeb Bush needs to drop out next.
He will be in until the convention. He wants to broker it. In a backroom deal, you KNOW he'd find a way to get that nomination. Party loses faith in Trump, deems him unelectable, and defers to an experienced statesman, party elder. Jeb!
Jeb = Frank Underwood from House of Cards. Won't win any states, still ends up with the nomination.