Mr. Specter’s approval numbers are, in one respect, even less enviable than Mr. Rendell’s. While 56 percent of polled voters said they approve of the senator’s job performance, 43 percent said he does not deserve to be re-elected next year while 40 percent said he does deserve it. Republicans were split 42 percent to 42 percent on that question while Democrats were split 41 percent to 42 percent, but 45 percent of independent voters said he doesn’t deserve re-election while 36 percent said he does.