A new poll shows Santorum tanking:

Pennsylvania State Treasurer Robert Casey, Jr., has opened a 52 - 34 percent lead over incumbent Republican U.S. Sen. Rick Santorum in the 2006 Senate race, according to a Quinnipiac University poll released today.

This compares to a 50 - 39 percent Casey lead in a July 13 poll by the independent Quinnipiac (KWIN uh-pe-ack) University....

Eighteen points behind. Nice.

Oh, and also in that Pennsylvania poll:

Voters disapprove 61 - 37 percent of the job President Bush is doing, his lowest score ever and down from a 53 - 44 percent disapproval July 13.

Bush barely lost Pennsylvania in 2004 -- it was 51%-49% Kerry.