If Bush does bomb Iran, I don't think the GOP will have a chance in '08.
Rudy has been droning on and on for months now about how "he is the only candidate capable of tackling Islamic Terrorism."
If Bush decides to bomb Iran, Rudy will continue to milk that statement for all its worth, which diehard Republicans and moderates will buy hook, line and sinker, if they haven't already by the time election day comes.
Rudy ends up elected and keeps Bush, Cheney, and all the other jokers around as his advisors, secretaries, etc, to continue the never-ending "War on Terrorism" while continuing to reap a lucrative financial reward of course
Therefore, I think Bush bombing Iran before the expiration of his tenure in office is extremely likely.
One would be foolish not to bet on Bush having some kind of "end game" up his sleeve