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PITTSBURGH (CBS) — Guns, immigration, and health care dominated the second and final debate in Pennsylvania’s U.S. senate race.

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Democratic incumbent Bob Casey and Republican challenger Lou Barletta squared off at the Pittsburgh studios of our sister station, KDKA-TV.

One question dealt with preserving the Obamacare guarantee of affordable health insurance for those with pre-existing conditions.

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Casey is seeking his third term.

Barletta is a fourth-term congressman from Hazleton.