PA in Play?

Some new polling from the state of Pennsylvania suggests that Santorum is solidifying his support there and is now tied with Romney for the GOP race.  Romney still outperforms Santorum by about 6 points in a possible head-to-head match-up against President Obama:

The statewide poll of 500 Republicans showed Santorum's support more than doubled from 14 percent six weeks ago to 30 percent, putting him in a statistical dead heat with former Massachusetts Gov. Mitt Romney, who increased his support to 29 percent from 18 percent. Santorum's gain was former House Speaker Newt Gingrich's loss, as his numbers here plunged from 35 percent to 13 percent....

Alone among the four Republican hopefuls, Romney was about even with Obama, with 45 percent to the president's 43 percent, in a head-to-head matchup in a poll of 800 Republicans and Democrats in Pennsylvania. Against Santorum, Obama was slightly ahead, 47 percent to 43 percent, among that group in the poll with a margin of error of plus or minus 3.46 percent.

Obama is polling below 50 in a state that has been a key Democratic hold.  If Pennsylvania is in play, the president's reelection bid could face some significant difficulties.  Pennsylvania last went Republican in 1988, when George HW Bush trounced Mike Dukakis.