“It is difficult to cast a negative vote on someone with the qualifications and background of Dean Kagan, but we have a major problem of institutional standing to find out from a nominee what the nominee thinks on important questions,” Specter said, referring to her title as dean of Harvard Law School.

“I have gone to some length to try to find out more about Dean Kagan. In the absence of being able to do so and to have a judgment on her qualifications, I am constrained to vote no,” he said.

Seven Republicans voted for Kagan, including Sens. Jon Kyl (Ariz.), Tom CoburnThomas (Tom) Allen CoburnMr. President, let markets help save Medicare Pension insolvency crisis only grows as Congress sits on its hands Paul Ryan should realize that federal earmarks are the currency of cronyism MORE (Okla.) and Orrin HatchOrrin Grant HatchCorker turns downs Trump's offer to be ambassador to Australia Democrats urge colleagues to oppose prison reform bill The Hill's Morning Report — Sponsored by CVS Health — Trump’s love-hate relationship with the Senate MORE (Utah).
Specter was also a Republican member of the Senate Judiciary Committee, which declined to take up Kagan's nomination to the U.S. Court of Appeals for the D.C. Circuit in the late nineties. Former President Bill ClintonWilliam (Bill) Jefferson ClintonMaybe a Democratic mayor should be president Trump, taxpayers want Title X funding protected from abortion clinics President Trump’s historic rescissions package is a welcome step to cut wasteful spending MORE nominated her to the bench in 1999.  

Recent polls show Sestak has pulled ahead of Specter in the primary race.
 
A new Muhlenberg College poll gives Sestak a four-point lead, 46 percent to 42 percent. A new Rasmussen poll shows Sestak ahead of Specter, 47 percent to 42 percent.
 
Sestak has gained political traction by raising Specter’s ties to prominent Republicans such as former President George W. Bush and former Alaska Gov. Sarah Palin.
 
Sestak launched an ad earlier this month with footage of Bush praising Specter as “a firm ally” he could “count on.”