The National Journal’s annual rankings of congressional voting records puts Sen. Tom Coburn, R-Muskogee, at the top of the list of the most conservative in 2011. Sen. Jim Inhofe, R-Tulsa, had the ninth-most conservative voting record.
Source http://blog.newsok.com/politics/2012/02/22/sen-tom-coburn-was-most-conservative-last-year/