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I’ve added the Pennsylvania results to the chart showing how Clinton and Obama have fared in our 10 political regions. For the first time, Obama leads in four regions, as his votes in Philadelphia and its suburbs push him to a narrow edge in the Northeast Corridor. And for the first time, Clinton’s strongest region is not El Norte, as her sweep across central Pennsylvania makes Cumberland her most reliable base of votes. Note that Clinton has a narrow lead in the popular vote because the Florida and Michigan primaries, while nonbinding, are included here.