Nine senators tied for most liberal in National Journal's 2010 Vote Ratings issue. Here's a look at the 10 most-liberal senators:
For the 10 most-liberal representatives head to the end of the gallery.
Tied for first—Sen. Sherrod Brown, D-Ohio
Although he could face a tough reelection battle in 2012, Brown shows no signs of trimming his sails. He was tied as the most-liberal senator in 2009, making it two years straight he’s been tied for most liberal.