Senator Arlen Specter stopped being the only Jewish Republican in the U.S. Senate earlier this year, and instead become the umpteenth Jewish Democrat in the U.S. Senate, in a somewhat desperate bid to hold on to his Pennsylvania seat. (He was pretty sure to lose a Republican primary challenge from the right.) Well, it doesn’t look like the gambit is working. In early may, the 79-year-old incumbent held as 53-33 lead over that conservative challenger, Rep. Pat Toomey. According to a Quinnipiac poll yesterday, that lead is down to 45-44.