From Political Wire:
Sen. Blanche Lincoln (D-AR) [is] tied with three potential Republican challengers who have essentially non-existent name recognition.
Analysis: “The numbers of course are more a reflection on Lincoln’s standing than that of the Republicans. Her approval rating is now 36%, with 44% of voters in the state disapproving of the job she’s doing. That’s a 13 point downward shift in her net approval rating, from 45/40 when we measured it in March. That largely tracks the 18 point decline in the President’s popularity over that time.”