Conservatives aren't necessarily Republicans.
But the R party is currently the home of the Conservative movement. (though, I sometimes wonder why)
Not bashing Bush, I voted for him three times, it's the nature of the beast that is politics.
Whatever a candidate promises, I expect them to do half that, not because they they don't want to, but because that is the way our system is setup and that is what the checks and balances are all about. I think Bush has done a good job, but he listens to a lot of people around him who didn't have to make campaign promises, and who have their own motives.