Kasich is going to be Trump’s VP if Trump gets the nomination.
Kasich is an insider and Trump needs an insider to learn the ropes in DC.
Kasich can deliver Ohio and some other purple Midwest states.
Kasich is from the left of center big government with a big heart wing of the Republican party, just like Trump.
Kasich is drawing the liberal Rubio and Bush votes away from Cruz, making it much easier for Trump to pick up delegates.
Kasich and Trump are already working together. Trump dropped out of the latest Fox forum and Kasich immediately followed suit, denying Cruz an important debate in the narrowed field. Coincidence?