California Democrat Barbara Boxer has long been considered one of the U.S. Senate's most liberal members, but according to the National Journal, she's in a five-way tie for being the 5th most liberal senator.
The Journal's ranking, based on voting records, has Oregon Democrat Jeff Merkley and New York's Kirsten Hillibrand tied as the Senate's most liberal members, followed by a two-way tie between Hawaii's Daniel Akaka and Dick Durbin of Illinois for third and then five-senator tie for fifth.
Boxer is tied with Sherrrod Brown of Ohio, Tom Harkin of Iowa, Barbara Mikulski of Maryland and Tom Udall of New Mexico. Maryland's Ben Cardin came in 10th.