There's been some confusion concerning Arizona Senator John McCain's prolife voting record.
Well, the best source is often your enemy, so the National Association for the Reform of Abortion Laws is the best place to turn. The pro-choice NARAL rates McCain a solid zero per cent on pro-choice issues. Check out their 14 page analysis here.
By the way, both Senators Barack Obama and Hillary Rodham Clinton are rated 100% pro-choice by NARAL.