Because it's a huge prize on Election Day, and despite the fact he is comfortably ahead, he cannot take it for granted.
21 electoral voters and its history as a swing state is why Obama is there.
If the polling is right, he doesn't need to and can go to FL or VA instead.
I get what you are trying to do here.
You are trying to convince yourself that the state is close, the polls are wrong, and that is why he is back in Pennsylvania.
You are entitled to your opinion, J.J. Perhaps Pennsylvania is close. But there have been numerous polls, from both sides of the aisle, that have shown PA a double digit race at this point.
