Sen. Bob Casey is locked in a tight race with Dave McCormick in Pennsylvania. There will be an automatic recount of the votes, state officials say.

The U.S. Senate election in Pennsylvania between Democratic Sen. Bob Casey and Republican challenger David McCormick is officially heading for a recount. The secretary of the commonwealth announced on Nov. 13 that a statewide recount is legally required based on the race’s unofficial results — which have Casey narrowly trailing McCormick.

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.