Arlen Specter

"That's the flaw that folks are tying into Specter," said Sam Hoff, political science professor at Delaware State University.

"Arlen Specter jumped from party to party twice now and is just trying to move his political career along," said Tom Ross, Delaware Republican Party chairman..

Source: http://www.delawareonline.com/article/20100519/NEWS02/5190350/Pa.-Democrats-oust-Specter