In this Wednesday, May 14, 2008 file photo, Sen. Arlen Specter, R-Pa., gestures during a news conference on Capitol Hill in Washington. Edward M. Kennedy, Robert Byrd, Arlen Specter _ fighters and history-makers all. Their battles with age and illness are the hallmarks of the nation's oldest-ever Senate and reminders of the fragility of power. (AP Photo/Jose Luis Magana)

Sen. Arlen Specter, R-Pa. meets reporters on Capitol Hill in Washington, Wednesday, April 16, 2008, to discuss the recurrence of cancer. (AP Photo/Stephen J. Boitano)

Sen. Arlen Specter, R-Pa. meets reporters on Capitol Hill in Washington, Wednesday, April 16, 2008, to discuss the recurrence of cancer. (AP Photo/Stephen J. Boitano)

Sen. Arlen Specter, R-Pa., meets reporters on Capitol Hill in Washington, in this Feb. 1, 2008 file photo. The Pennsylvania Republican says in a statement that he has been diagnosed with an early recurrence of Hodgkin's disease, which is a cancer of the lymph system. (AP Photo/Lauren Victoria Burke)

Sen. Arlen Specter, R-Pa., talks about his new book, "Never Give In Battling Cancer in the Senate", Thursday, March 13, 2008, on Capitol Hill in Washington "I think we ought to let it all hang out because when somebody is stricken with cancer, or heart disease, or Parkinson's or Alzheimer's, they ought to know they are not alone," said Specter in an interview from his Capitol Hill office. (AP Photo/Kevin Wolf)

Sen. Arlen Specter, R-Pa., talks about his new book, "Never Give In Battling Cancer in the Senate", Thursday, March 13, 2008, on Capitol Hill in Washington "I think we ought to let it all hang out because when somebody is stricken with cancer, or heart disease, or Parkinson's or Alzheimer's, they ought to know they are not alone," said Specter in an interview from his Capitol Hill office. (AP Photo/Kevin Wolf)

Then-Senate Judiciary Committee Chairman Sen. Arlen Specter, R-Pa., reacts to Justice Sandra Day O'Connor's retirement announcement on Capitol Hill in this July 1, 2005, file photo. "When you look at yourself in the mirror every day and see your face turning gray, and you're becoming pallet and you're losing all your hair and you're bald, and you've been told that you only have a certain percentage chance for living five years, (it) makes every day more meaningful," Specter said during a March 13, 2008 interview from his Capitol Hill office. (AP Photo/Dennis Cook, File)

Sen. Arlen Specter, R-Pa., ranking Republican on the Senate Judiciary Committee, meets reporters on Capitol Hill in Washington, Friday, Feb. 1, 2008, where he called on the NFL to explain why it let evidence of the New England Patriots cheating scandal be destroyed. (AP Photo/Lauren Victoria Burke)

Sen. Arlen Specter, R-Pa., ranking Republican on the Senate Judiciary Committee, meets reporters on Capitol Hill in Washington, Friday, Feb. 1, 2008, where he called on the NFL to explain why it let evidence of the New England Patriots cheating scandal be destroyed. (AP Photo/Lauren Victoria Burke)

Sen. Arlen Specter, R-Pa., ranking Republican on the Senate Judiciary Committee, meets reporters on Capitol Hill in Washington, Friday, Feb. 1, 2008, where he called on the NFL to explain why it let evidence of the New England Patriots cheating scandal be destroyed. (AP Photo/Lauren Victoria Burke)