An automatic recount has been triggered in the U.S. Senate race in Pennsylvania between Bob Casey and Dave McCormick. Here's how the recount will work.

The U.S. Senate election in Pennsylvania between Democratic incumbent Sen. Bob Casey and Republican David McCormick is headed for a statewide recount, as counties continued Wednesday to sort through outstanding ballots and the campaigns jousted over which ones should count.

CBS News has not issued a projection in the race. Pennsylvania Secretary of the Commonwealth Al Schmidt announced Wednesday afternoon that unofficial results in the race have triggered a statewide recount. That's because vote totals for McCormick and Casey ...