I haven't done enough research to know if McCain's voting record backs up what he said (I think he's a bit sketchy on abortion), but he gave an answer. Obama dodged the question . . . and I know that he has a pro-choice voting record. While I don't believe a candidate's stance on abortion is the most important issue to consider, it's still very important. And I think Obama's dodging the question may hurt him more than if he'd said, "At birth," even though he was speaking to a largely pro-life audience.
Here's what I love most about Noonan's article--her explanation of when life begins:
"As to the question when human life begins, the answer to which is above Mr. Obama's pay grade, oh, let's go on a little tear. You know why they call it birth control? Because it's meant to stop a birth from happening nine months later. We know when life begins. Everyone who ever bought a pack of condoms knows when life begins.
To put it another way, with conception something begins. What do you think it is? A car? A 1948 Buick?"
Preach it, Sister!