Once balanced information about Obama and McCain's respective positions on choice is introduced, Obama gains 6 points overall, with his lead in battleground states expanding from a net 2 points (47-45 percent) to a net 13 points (53-40 percent).This kind of stuff is more than normally tricky, since you can almost always get a fair number of people to change their view by reading some carefully chosen critiques of whatever issue you're polling about. Still, in this case GQR's statement was fairly straightforward: Obama believes abortion is a personal decision and supports Roe v. Wade, while McCain is pro-life and wants to overturn Roe v. Wade. All by itself, that produced a 6-point swing.
....Despite the fact that the national focus seems to be on the economy, among pro-choice Independent women, pro-choice Republican women, and liberal to moderate Republican women, the issue of abortion produces a larger advantage for Democrats than the economy, the war in Iraq, or health care. Moreover, among these three groups critiques on McCain's anti-choice position are the strongest attacks against him, trumping attacks on the economy, the war, and special interests.
Abortion is unlikely to be a major issue in this year's election, but it's not a big effort to simply make sure that voters know McCain's actual position: He thinks abortion should be illegal, and if he becomes president he'll do his best to appoint Supreme Court justices who think so too.