From CNN:

President Barack Obama said Wednesday he supports same-sex marriage, raising the political stakes on an issue in which Americans are evenly split.

The announcement, long sought by supporters of same-sex marriage, puts Obama squarely at odds with presumptive Republican presidential nominee Mitt Romney.

"At a certain point I've just concluded that for me, personally, it is important for me to go ahead and affirm that I think same-sex couples should be able to get married," Obama said in an interview with ABC News.

Obama once opposed same-sex marriage. He later indicated his views were "evolving." His announcement Wednesday in support of same-sex marriage was the first by a sitting president.

It was not immediately clear how Obama's decision might play out at the voting booth.

A Gallup Poll released Tuesday indicated 50% of Americans believe same-sex marriages should be recognized by law as valid, with 48% saying such marriages should not be legal.