Scroll on down!
Based on what criteria?
Not according to this ranking.
http://www.nationaljournal.com/2010voteratings
Or even his own web site.
http://www.dailypaul.com/127157/national-journal-ranks-ron-paul-140th-most-conservative-member-of-house
Or here.
http://tpmdc.talkingpointsmemo.com/2011/02/nine-dems-tie-for-most-liberal-senator-eight-gopers-for-most-conservative.php