The perceived tightening of Pennsylvania polls seems to be due entirely to an increase in McCain support - undecideds coming home to McCain. But since Obama's support is above 50%, for McCain to pick off Pennsylvania would require a decrease in support for Obama - and there's no evidence of that. Obama's support has held steady, with the Pollster trend at 52% and only a couple polls coming in below 50%.
So concern over Pennsylvania tightening is misplaced - the polls actually show no reason for concern. The only cause for worry would be a pretty severe Bradley effect - people telling pollsters that they are voting for Obama when they actually will vote for McCain.
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