The reason you don’t remember is that there wasn’t any outrage from the Left concerning Obama’s position on gay marriage. If anything, the Left loved Obama even more. Ellen DeGeneres didn’t see fit to question Obama on gay marriage during an October 2008 appearance on her show via satellite. Instead, Ellen grilled him on such pressing matters of state such as Halloween, George Clooney, and dancing. Let’s just say that Ellen didn’t give John McCain the kid glove treatment even though his position on gay marriage was exactly that of Obama’s. And if not for Vice President Biden’s loose lips, Obama’s public position on gay marriage in 2012 would have been the same as it was in 2008 and, for that matter, the same as it was during much of 2012. I submit that if President Obama still maintained that marriage was between a man and a woman that he would not lose a single liberal or progressive vote. Did the Left ever give Dick Cheney props for supporting gay marriage before his distant cousin President Obama? When push comes to shove, the Left doesn’t really care about gay marriage all that much.
This, of course, isn’t to say the Left doesn’t care about gay marriage at all. The Left certainly cares about gay marriage when it’s a white, Christian conservative who says marriage is between a man and a woman.