It looks like the Republicans' gambit to get a Green candidate on the ballot in Pennsylvania is succeeding, by pulling votes from the Democratic candidate -- though not enough (yet) to throw the race to the GOP.

According to a new Quinnipiac University poll, with the Green, Democrat Bob Casey leads Rick Santorum 45 percent to 39 percent; Green Party candidate Carl Romanelli picks up 5 percent. In a two-way race, Casey leads 47 percent to 40 percent.