If exit polls were correct, Kerry would be President. By the way, I'm not saying that gay marriage didn't play a big part, it did. But not abortion.
If you were right, the Democrats wouldn't be talking about "changing their image" on abortion -- and even possibly making a pro-lifer (Roemer) their next chairman. They understand that abortion is a key "values" issue that moves millions of voters, and that has played a big part in sending their party to electoral Siberia.