At some point you have to ask; would that be better? Jimmy Carter was maybe the best thing to happen to conservatism in the 20th century. Before him we had two liberal Republicans, after him we had Reagan, and RINOs became a lot rarer.
Gay marriage is a no-lose issue for the GOP. A large majority of Americans are against it. We had a very similar amendment to the FMA in our state, and it passed nearly 3:1, with every major newspaper against it. If GWB can't get behind the FMA, you have to question his conservatism. You can't argue it's politically harmful; all the evidence is it's a winner. So what's the problem?