If McCain is the GOP nominee, it won’t matter who we vote for. The Republican Party of Ronald Reagan will have been destroyed.
George Bush' Republican party took that control away from the Dems in Bill Clinton's first term.
Please don't try to confound "Ronald Reagan" and "Republican party". There are different ambitions and capacities involved. Ronaldus Magnus was taking on the world when the Republicans were still cowering in the Capitol basement bemoaning their fate.
Ronaldus did business with Tip O'Neil because he had too, but Tip O'Neil did business with Ronaldus because he respected him and his ideas.