George Bush was no Reagan, yet he served Reagan well.
Might as well go with a Trump Hillary ticket. It would not matter.
Unfortunately, he didn't serve the country well after he won in his own right.
Bush the elder was the biggest mistake Reagan made. His 1990 read my lips lie was the beginning of the long road to today, the end of the republican party. Bush the Elder gave us Clinton, who begat the Shrub, who begat obama.
Last night at the debate, Trump specifically attacked Cruz and Rubio for being in the pockets of special interests... but "not the Governor." Kasich wasn't just left out of the attack; he was specifically excluded.
Trump has given hints as to who he'd pick as a running mate. He said he would pick a politician... "We don't need two of me." and he said logic would dictate someone from a battleground state.
Kasich is generally well liked within the party. He's held up fairly well in the campaign. He would "unite the party."