Nate Silver points out that Santorum is effectively blocked from seeking statewide federal office in Pennsylvania which means his future is up in the air: Mr. Santorum could also look to statewide office in Pennsylvania, but that might require a reasonably long wait. The incumbent governor there, Tom Corbett, is a Republican and is eligible for another term in 2014, so Mr. Santorum would either need to mount a primary challenge or hope that Mr. Corbett retires. Of Pennsylvania's two incumbent senators, one is a Democrat, Bob Casey, who resoundingly defeated Mr. Santorum in 2006 and who remains fairly popular. Because Mr. Casey is on the ballot again this year and it is too late for Mr. Santorum to challenge him, he would need to wait until 2018 for a rematch. Pennsylvania's other incumbent senator, Pat Toomey, will be up for election in 2016. But Mr. Toomey is a Republican who is relatively young and who is too conservative to be vulnerable to a primary challenge. Mr. ...(Read Full Post)