If McCain is widely considered as representative of the Republican Party (who is the first Pubbie to cross the aisle to make nice with the Dems on virtually every contentious issue we've faced in the last 20 years), then I am not a Republican. He routinely votes against my interests. He's a "big government" status quo kind of guy who'd be the last person on earth I'd expect to really try to promote federalism, to reform or downsize Washington.
Though he gets high marks for some reason on international relations and military affairs, I can't even trust him there (e.g., his pontificating, self-serving hostility to waterboarding).
IMHO, he's an arrogant, nasty narcissist, a spoiler and disrupter of a once-great political party. His election as president would tell me the GOP is dead, de facto if not de jure.
When a RINO wins in New Hampshire and FReepers cheer, the GOP is dead.