Political Wire reports a poll that shows Sen. Blanche Lincoln (D-AR) tied with three potential challengers who lack any name recognition.

Lincoln has 40 percent, Gilbert Baker and Curtis Coleman have 42 percent and 41 percent respectively, and Tom Cotton has 39 percent. They of course are all Republicans.

Her approval rating is 36 percent, while 44 percent of the voters in the state disapprove of her job performance. She is down 13 points since March.

UPDATE: Powerline has this comment. I believe it would be difficult to unseat her.