With the Democratic primary still two weeks from being decided in a June 22 runoff, North Carolina Sen. Richard Burr (R) continues to hold strong leads over his two potential foes, Elaine Marshall and Cal Cunningham, a new Rasmussen survey finds (June 3, 500 LV, MoE +/- 3%). Still, Burr's support is right at the threshold of vulnerability for incumbents, as he takes 50% against Marshall and just 47% against Cunningham.

Burr 50 (+2 vs. last poll, May 5)
Marshall 36 (-4)
Und 8

Burr 47 (-3)
Cunningham 35 (-2)
Und 10

RCP currently rates this race Lean Republican.

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