A new Franklin & Marshall poll shows that Sen. Arlen Specter (D-PA), who switched parties in late April in order to avoid a likely defeat in the Republican primary, has low ratings with both parties' voters now.

The numbers: Only 28% of registered voters say he deserves another term, to 57% who say it's time for a change. Back in March, before there was any widespread notion that he would switch parties, this question yielded a much healthier (though still not great) answer of 40%-46%.

In a Democratic primary between Specter and Rep. Joe Sestak, the big winner is... "undecided," with 48%, while Specter is at 33% and Sestak has 13%.

"I think what he's got going is the worst of both worlds," said pollster Terry Madonna. "Republicans have fallen away from him because he left his party, and Democrats are unhappy with him for lots of different reasons."