Specter did not run in the 2010 Republican primary; he switched parties in 2009 and lost the 2010 Democrat nomination. Surely, Santorum wasn’t backing him in the Democratic primary.
Do you have any proof of that? Cornyn was certainly backing Specter and Sestak over Toomey, even though he wasn't announcing such publicly.
Read post 49, that is what it says, Santorum was supporting him in 2009 for the 2010 cycle before he switched parties, then Specter gave back the $5,000.00.
Santorum was a lifelong devotee of Specter, Arlen Specter was also supported by, endorsed by, and campaigned for, by Santorum during Specter’s 1996 Presidential run to make the GOP a pro-abortion party.
“”Specter was up for re-election to the Senate in 2010, and expressed his plans to run again. On March 18, 2009, Specter said that he was not considering running as an independent. He said, “To eliminate any doubt, I am a Republican, and I am running for reelection in 2010 as a Republican on the Republican ticket.” Subsequently Specter’s 2004 conservative GOP primary challenger, Pat Toomey, announced he would again run for the Republican nomination in the Republican senatorial primary.
However, on April 28, 2009, Specter stated that “As the Republican Party has moved farther and farther to the right, I have found myself increasingly at odds with the Republican philosophy and more in line with the philosophy of the Democratic Party.” He said that he was switching party affiliation and would run as a Democrat in the 2010 election.””