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    Critical Counties — Bucks, Pennsylvania: Blue since '92

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Critical Counties — Bucks, Pennsylvania: Blue since '92

CNN's John King examines the counties that he'll be keeping a close eye on on Election Night. Next up: Bucks County, Pennsylvania — a pivotal swing county just outside of Philadelphia.

Critical Counties — Bucks, Pennsylvania: Blue since '92

CNN's John King examines the counties that he'll be keeping a close eye on on Election Night. Next up: Bucks County, Pennsylvania — a pivotal swing county just outside of Philadelphia.