Sullivan
Andrew Sullivan has a lot more riding on this than I do, and he's taking it very personally. On my list of issues on which to select a presidential candidate, this runs very low. Probably not the case for Sullivan and some others, like the Log Cabin Republicans.
I don't see this as a killer issue for Bush, and had it not been forced in the past weeks, I suspect he would have ignored it. Lord knows Arnold Schwarzenegger wanted to ignore it until he got his nose rubbed in it.