My position on abortion has been, as politicians put it, evolving. I was once pro-choice and a contributor to Naral. Now I'm pro-choice but anti-Naral. The group has a genius for alienating potential allies, as demonstrated by the television commercial it introduced this week and then hastily withdrew after a barrage of criticism. The ad, which featured footage of a bombed abortion clinic and a victim in a wheelchair, accused Judge John Roberts Jr. of siding with clinic bombers and having an ideology that would "excuse" their attacks. What Mr. Roberts actually did, on behalf of the administration of the...