From NBC's Mark Murray
McCain brought up that Obama "has the most liberal voting record..."
He and his campaign have made this charge throughout the general election, but it's a bit misleading. The charge is based on the vote ratings for 2007 by the non-partisan National Journal magazine. Indeed, for that year, he ranked as the most liberal senator (voting the liberal way 65 out of 66 votes, per the magazine).
But in 2005, the magazine ranked Obama as the 16th-most liberal senator. And in 2006, his rank was 10th.
So it's correct for McCain to say that Obama was the most liberal senator for 2007. But the "most liberal senator" overall is a bit misleading….