I reiterate: There will be a massive turn out of the Republican side regardless of who the candidate is if they hope at all to win! They have carefully orchestrated things to influence the election from both sides ever since McCain pretty much became the defacto candidate. They're probably the reason that Hillary and Obama are the only two left instead of having just one candidate.

Also a reiteration: They'll let the two beat each other up while McCain runs on his own!