From NBC's Mark Murray
National Journal has released its congressional vote ratings for 2008. A year ago, the magazine ranked Barack Obama as the Senate's most liberal member, which became a chief talking point for the McCain campaign and the GOP during the presidential election.

This year's most liberal senator is -- drum roll, please -- Patty Murray. The most conservative senator? A four-way tie: John Barrasso (WY), Mike Enzi (WY), John Ensign (NV), and Jon Kyl (AZ).

Click here for more on NJ's ratings.