I dearly hope Kasich is not the choice for vice president . He is extremely liberal . Ohio is not doing as great as he says it is.
By far the most important thing about the VP pick is his/her ability to help get the ticket to 270 EV.
Any other consideration is a distant second in importance. The President can shape his circle of advisors, cabinet heads, etc any way he wants once elected. But he has to get elected.
Adding to the ticket’s chances at 270 EV requires that the VP nominee have significant key state, regional, or key voting block appeal. And oh yeah, he/she has to be a credible back up POTUS.