Yet another poll showing that Arlen Specter is losing his mojo for the 2010 Senate race. This comes courtesy of Rasmussen:

The latest Rasmussen Reports telephone survey of Pennsylvania voters shows 45% would vote for Toomey if the election were held today. Forty percent (40%) would vote for Specter, while six percent (6%) prefer a third option. Nine percent (9%) are undecided.

If Sestak wins the Democratic nomination, however, the race is a toss-up: 38% for [Democratic Congressman Joe] Sestak and 37% for Toomey.

That's actually an improvement for Specter, who Rasmussen showed trailing Toomey by double-digits this summer, at the height of the healthcare fracas.  And for what this is worth, Rasmussen has a reputation for skewing conservative.

But what's most interesting to me is that this poll shows that Joe Sestak appears to be viable, and electable ... despite the fact that Gov. Ed Rendell and other powerbrokers have lined up behind Specter.

Sestak was in our office recently, and I'm going to do a blog post about that encounter by day's end. For now, suffice it to say that it's pretty clear what's driving the numbers here: Republicans are more excited about beating Specter than Democrats are about electing him. From Rasmussen:

Eighty percent (80%) of Republican voters now favor Toomey in a match-up with Specter while the incumbent senator draws just 65% of the Democratic vote.