Santorum is losing in his home state:
Mitt Romney's taken the lead in PPP's newest poll of Rick Santorum's home state of Pennsylvania. Romney has 42% to 37% for Santorum with Ron Paul at 9% and Newt Gingrich at 6%. The numbers represent a dramatic turnaround from when PPP polled the state a month ago. Romney's gained 17 points, going from 25% to 42%. Meanwhile Santorum's dropped 6 points from 43% to 37%, for an overall swing of 23 points in the last four weeks.
Weigel points out that "Pennsylvania is the only one of five April 24 states where Santorum has the advantage":
If you were already ignoring the GOP primary, I'm sorry for interrupting.
(Photo: With supporters on stage behind in his hometown of Mars in northwestern Pennsylvania, Republican Presidential Candidate Senator Rick Santorum speaks to a half-full ballroom at an election night party in Mars, Pennsylvania, Tuesday, April 3, 2012. By Melina Mara/The Washington Post via Getty Images)