Blanche Lincoln, AR 45% Public Policy Polling, March Barbara Boxer, CA 48% Survey USA, June 12-14 Michael Bennet, CO 34% Public Policy Polling, April 24-26 (trails Rep. Beauprez) Christopher Dodd, CO 37% Quinnipiac, April (trails several) Roland Burris, IL 17% Public Policy Polling, April 24-26 (likely to lose primary) Harry Reid, NV 34% Mason-Dixon, June 18-19 Kirsten Gillenbrand, NY 24% Marist (disapproval rating also below 50%) Byron Dorgan, ND (only poll in this red state was commissioned by DailyKOS) Also in possible danger but above 50% approval: Daniel Inouye, HI leads Republican Gov. Linda Lingle, but he'll be 86, and...