Roughly, but going back down in some polls. Opposed tend to vote it single-issue more than those for. I think in terms of votes it's a slight edge for Romney; but not likely to be a big factor.
Sleeper factor may be blacks strongly opposed affecting their turnout a bit. Not sure how all this breaks down in battleground states.
It depresses black church vote to some degree, and it polarizes evangelicals into ABO to some degree. Added up, it eliminates the South from Bobo's electoral map and it opens up the Rust Belt for Mittens. And Bobo literally cannot afford to play defense all fall in WI, MI, PA. Lose just one of those states and he has no path to victory.