Sen. Richard Burr (R-N.C.) continues to lead potential Democratic challengers despite his perpetual sub-40% approval rating, a new PPP survey finds (Sept. 2-8, 600 RV, MoE +/- 4%).

Democrats the survey matched up against Burr in hypothetical general election races include: former state senator Cal Cunningham, U.S. Rep. Bob Etheridge, Chapel Hill Mayor Kevin Foy, attorney Kenneth Lewis, Secretary of State Elaine Marshall (who filed her candidacy paperwork Wednesday) and former Lt. Gov. Dennis Wicker.

Burr 42 - Cunningham 30 - Und 29
Burr 41 - Etheridge 34 - Und 25
Burr 43 - Foy 29 - Und 29
Burr 43 - Lewis 27 - Und 29
Burr 42 - Marshall 31 - Und 27
Burr 42 - Wicker 31 - Und 27