If you are someone running for political office in, oh lets just say, 2012, perhaps you might want to include the following graph in your intel.
The two lines you see on this chart represent two separate opinions - those in favor of same sex marriage being legalized and those who don't.
See that blue line that is vastly creeping upward? Yeah, that's the amount of people who want to see gay couples have the right to get married. See that red line nose-diving below the blue line? That's the amount of people who aren't so cool with it. It's not by much, but which stance has the higher percentage of public opinion in it's favor? Oh yeah, THE BLUE ONE!
Time to wise up, Washington! Your country is ready for a change. Get on board!