I think wasting time attacking Obama on gay marriage would be a waste of time for the Republicans, especially considering trends on the opinion of gay marriage.
http://fivethirtyeight.blogs.nytimes.com/2012/05/09/support-for-gay-marriage-outweighs-opposition-in-polls/#more-30767
Now, it is entirely possible (and likely) that people who are against gay marriage are more likely to turn out and vote (especially considering the widely varying view of gay marriage based on age and how elderly are more likely to vote than teenagers or individuals in their twenties). But with the multitude of actual issues republicans could attack him on, wasting time on this almost seems like falling for a trap.
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Moops?
"I thought you were making up diseases? That's spontaneous dental hydroplosion."