While you aren’t seeing a huge wave of support one way or another over same sex marriage Romney gets more of a boast because of his opposition (23% say they are more likely to vote for Romney, 20% among independents) than what Obama sees from his support (16% are more likely, 14% among independents). 25% of voters registered said they were less likely to support Obama as a result of his endorsement, 22% of independents.
Also nationally 51% of Americans don’t believe same sex marriage should not be made legal. While certainly you see this as a prevailing view among Republicans (81%), a majority of independents (53%) say it should not be made legal and 25% of Democrats say it shouldn’t be. There is, to be expected, a gap when you compare 18-44-year-olds to those 45 or older. A majority among younger voters 55% to 44% believe same sex marriage should be legal. A majority of older Americans believe it shouldn’t be, by a larger margin, 56% to 31%. 50% of those surveyed favor a marriage amendment.
Looking at 2012 while the economy still is the top issue, an issue that Obama will have problems with, his position on same-sex marriage isn’t going to do him any favors either. So from a political point of view his recent endorsement seems like a miscalculation on Obama’s part and will do him more harm than good. Especially when coupled with a struggling economy.