If Obama endorsed same sex marriage, would it help his campaign?

[The Mikado]

I think, sadly, 2012 it's still an overall net negative, but not one that would hurt his campaign all that much.  Marriage equality is, now, essentially a 50/50 issue.  It's nowhere near as good a wedge issue for the GOP as it was in 2004.

I think it's a pretty safe bet that the 2016 Democratic nominee will be unabashedly pro-marriage equality.

[The Mikado]

Considering Mexico already has de facto marriage equality (they have same sex marriage in Mexico City and marriages in Mexico City are valid throughout the rest of the country)...