Burr, a Winston-Salem Republican, was the 90th most liberal senator on the magazine's annual conservative-liberal rating feature.
U.S. Sen. Kay Hagan, a Greensboro Democrat, was the 42nd most liberal member of the Senate and the 55th most conservative.
The ratings are based on how members of the Senate voted on 99 roll-call votes, a system first devised by the Washington-based magazine in 1981.
The ranking would seem to help back Burr's claim that it's tough to get to the right of him, ideologically speaking. (Actually, Burr said it was impossible, which isn't true since eight other senators were ranked more conservative, but who's counting?)
Brad Jones, one of Burr's primary challengers, said he is running to provide a more conservative alternative for voters.