Well, it’s official. Mr. Bush has sided with the forces of bigotry and hatred. The last time an action was prohibited through the Constitution, it lasted just over a decade. There’s a very entertaining history of the issue here.
I’m not going to try to guess what the political outcome of this might be, but I can certainly see some of the loonier parts of the Republican party going way overboard in their campaigning for this issue (see Pat Buchanan’s speech at the 1992 Republican convention for an example), causing a backlash from moderates in their midst, as happened in 1992.
I would just ask Mr. Bush and his married supporters, “Now that some thousands of people have gotten married in San Francisco, has your marriage been endangered by them? Have they called you to suggest you divorce? Just how has your marriage been affected?” If you’re honest, you’ll answer, “Not at all.”