The Remaining "Not Trump"

Colbert had a bit on the scary nature that Ted Cruz is the final guy here, Kasich in theory the "sane" one (if with the usual crazy conservative beliefs) but having no chance. So, we are left with something of a longshot whose "sanity" (see, e.g., foreign policy team) leaves a lot to be desired. If Republicans like Lindsey Graham want to make an effort here, why not support Kasich? Really, with the remaining states, he has a shot at stopping Trump from getting a majority. Plus, unlike Cruz, he is basically someone the usual suspects can live with.