Once again Becky, the Girl in Short Shorts, has the scoop. Not only does she take you through the nearly uniform anti-gay positions of the major presidential candidates, she also lays out the issues that are critical, especially to gay and lesbian couples.
She ends up with the conclusion that gays have no other choice than to vote Libertarian.
[No, sorry, Ron Paul doesn't come out very well.]
[Outright Libertarians has already endorsed Libertarian presidential hopeful George Phillies. I don't know much about Phillies as a candidate, but I do remember him as the original dominant American player of Avalon Hill's Stalingrad game back in the 1960s-70s.]
Beyond the gay/lesbian issue, this situation raises a fundamental question about a two-party system, as opposed to a more open multi-party system.
With only an either/or choice pragmatically available, we are virtually guaranteed to elect least common denominator candidates. No serious candidate for national office can afford to oppose the prejudices of the great mass of the electorate. If 75-80% of the American population opposes gay marriage, then guess what?