HARRISBURG, Pa. (AP) — Democratic U.S. Sen. Bob Casey and Republican challenger David McCormick disagreed on clean energy policy, gun laws and abortion rights in a fast-moving debate Tuesday night, as they accused each other of lying and shared a stage for the last time before the election.

The 60-minute debate was their second in two weeks as voting by mail ramps up in Pennsylvania and tens of millions of dollars pour into the swing state race every week. Control of the Senate is on the line, and the race is on track to be the nation's second most expensive in this year's election.

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