National Journal has ranked Sen. Barack Obama as the most liberal member of the Senate. Sen. Hillary Clinton ranked 16th.

The magazine ranks members of the Senate and House annually based on key votes in each chamber. Using 99 specific Senate votes in 2007, Obama finished with the most liberal record, after ranking 16th and 10th in his first two years in the Senate.

In 2004, National Journal ranked John Kerry as the most liberal senator, and the Bush campaign often used this as a talking point.