North Carolina Sen. Richard Burr (R) is still polling below 50% with a job approval rating of 35%, according to a new Public Policy Polling survey, but he continues to lead his potential Democratic challengers by double digits. A quarter of voters remained undecided.

Former state Sen. Cal Cunningham, Secretary of State Elaine Marshall and attorney Kenneth Lewis still suffer from a name ID disadvantage, with at least seven-in-10 voters holding no opinion of them. The Democratic primary will be held May 4.

Burr 43 - Marshall 33 - Und 23

Burr 44 - Cunningham 32 - Und 24

Burr 44 - Lewis 31 - Und 25

Click through to see other polling results for Burr against Marshall, Cunningham and Lewis.

The survey was conducted Feb. 12-15 of 788 RV with a margin of error of +/-3.5%.

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