According to the latest PPP survey:

John Boozman will enter the Arkansas Senate race this weekend as the frontrunner. He leads incumbent Blanche Lincoln by an amazing 56-33 margin in our first poll of the race.
Lincoln’s approval rating has sunk to just 27%, with 62% of voters in the state disapproving of her. She’s at a middling 51% even within her own party and just 17% of independents and 9% of Republicans are happy with how she’s doing.

What does the poll identify as the fulcrum of Lincoln’s precipitously declining numbers? You guessed it: Obamacare:

61% of voters in the state oppose the President’s plan, and among those folks Lincoln’s approval rating is just 8% with 79% of them expressing the belief that she’s too liberal. But she’s managed to antagonize a lot of the people who support the Democratic health care plan as well- 36% of them think she’s too conservative and her approval with them is just 57%. Barack Obama’s at 95% with that same group of voters.

Nor do other Democrats fare well in a general:

Lieutenant Governor Bill Halter basically polls the same as Lincoln, trailing 53-30. General Wesley Clark trails 51-36. Congressman Mike Ross is at a 48-37 disadvantage. And perhaps most surprising, highly popular and even more highly unlikely to run for the Senate Mike Beebe trails 44-43 in a hypothetical contest despite a 59/22 approval rating that rates among the best for any politician we’ve polled across the country this year.

UPDATE: on the heels of the PPP survey, Rasmussen has more bad news for Lincoln: she tops out at 36 percent in match-ups against five potential Republican nominees. (Via RCP).

Boozman (R) 54

Lincoln (D) 35

Baker (R) 52

Lincoln (D) 33

Hendren (R) 51

Lincoln (D) 35

Coleman (R) 50

Lincoln (D) 34

Cox (R) 50

Lincoln (D) 36