The majority of conservative voters won't vote for either Rudy or McCain no matter what you believe because neither one of them is conservative enough. The majority of conservative voters would rather stay at home on election day than vote for those two. The remaining conservative voters, who wouldn't stay at home on election day, would end up either blanking the Presidential/Vice Presidential race, or vote for the Presidential/Vice Presidential candidates from either the Constitution Party or the Libertarian Party unless some strong Independent run by a conservative should also happen.