The Quinnipiac University telephone poll conducted last June 13 disclosed that Bob Casey's lead over Sen. Rick Santorum since October was 52% to 34% (with sampling error of +/- 3 percentage points). Santorum's job approval rating has also dropped to 38%. Base on the poll results, Clay Richards (Quinnipiac poll assistant director) said, "Sen. Santorum appears to be his own worst enemy in his battle for re-election."