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Okay, the people for whom gay marriage is more than a symbolic issue are those of us who might want to get one someday.
For him to abandon us in order to win reelection would be an awful move and I think I might even be more upset to think that was happening than to see Romney win. If we've got a Democrat as a President who won't do anything differently than any given Republican because he's trying to appease Congress and the electorate, what's the point?
Statistics have shown that support for marriage equality is increasing, rapidly and dramatically. Even if he loses in November, ultimately, that's where we're clearly headed, and he is doing the right thing by standing on the side of equality.