To those who say that their support for Bush because of his war on terror trumps their opposition to amending the Constitution, Andrew Sullivan puts it best:

THE PRESIDENT’S CONTRADICTION: So you can see, perhaps, why the bid to write anti-gay discrimination into this very Constitution provokes such a strong response from me – and so many other people, gay and straight, and their families. It robs us of something no one in this country should be robbed of – equality and inclusion in the founding document itself. When people tell me that, in weighing the political choices, the war on terror should trump the sanctity of the Constitution, my response is therefore a simple one. The sanctity of the Constitution is what we are fighting for. We’re not fighting just to defend ourselves. We are fighting to defend a way of life: pluralism, freedom, equality under the law. You cannot defend the Constitution abroad while undermining it at home. It’s a contradiction. And it’s a deeply divisive contradiction in a time of great peril.