By hanging on way too long, he torched any chance he’ll be the Veep nominee.
He backed himself in a corner and then Romney came along to put the pin in the balloon.
He also has kept is so that McCain needs 52% of the remaining pledged delegates to secure the nomination six months from now. I believe it is a good thing, if McCain does win the nomination, that Huckabee will not be tied to that train wreck as VP.