Kasich IS the class act in the race. Not as ideological, to be sure - he's a pragmatist, and appeals to some of the same centrist voters that the polls suggest may be gravitating to Trump.
He's the only candidate to have quality experience in all three facets of government. He was a distinguished Congressman (and a true movement conservative, for those of us old enough to remember), worked on security issues with a Republican administration, and of course is wildly popular in Ohio for a couple of terms of excellent stewardship.
Sure, he pissed off the hard right when he accepted that Medicaid funding. Yes, it didn't help the national political battle against ObamaCare, but it did help a lot of Ohio's working poor. It sucks to have no recourse for family sickness other than an emergency room.
Kasich is, to me, the most authentic Christian of all the candidates. What he says has the ring of truth - St. Peter won't ask a politician whether he cut taxes, he'll ask him whether he helped the poor. That is Christian grace, that is the sort of heart I want to see in a President. But listen to Kasich on foreign policy - you don't here any kumbaya out of him when he addresses the Islamofascist threat.
Kasich would be a great asset to the ticket. It would also reflect well on Trump, a man who many view, to put it mildly, with great suspicion.