Barack Obama leads Mitt Romney in Pennsylvania by only 4 points, according to a new Quinnipiac poll. Of the 1,519 likely voters in Pennsylvania polled, 50 percent support Obama and 46 percent support Romney. That's an 8-point swing in Romney's favor from the previous Quinnipiac poll of Pennsylvania, which showed Obama with a healthy 54 percent support and Romney with just 42 percent.

According to the Real Clear Politics average of polls, that puts Obama's lead in Pennsylvania at just 5 points. That's the closest the candidates have been in the RCP average since March. Pennsylvania's 20 electoral votes would be critical for a Romney victory in November, but no Republican has won the Keystone State since George H.W. Bush did in 1988. Since then, George W. Bush came the closest to winning Pennsylvania when he lost to John Kerry there by just 2.5 points in 2004.

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