Competitive Pennsylvania race turns on suburban Philadelphia

FILE - In this July 17, 2007, file photo, an oil refinery in operation. The Democratic National Convention is heading to Philadelphia, but Hillary Clinton has her sights set just beyond the city limits. From the oil refineries in southern Delaware County to the 18th-century barns north in Bucks County, the suburban collar has grown over time to account for more than one-fifth of all Pennsylvania voters. In the past decade and a half, its political profile has shifted from decidedly Republican to narrowly Democratic. (AP Photo/Rusty Kennedy, File)BRYN MAWR, Pennsylvania (AP) — The Democratic National Convention is heading to Philadelphia, but Hillary Clinton has her sights set just beyond the city limits.

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