As vote counting continues this week in Pennsylvania’s tight Senate race, attention is once again shifting toward the largest and most hotly contested tranche of remaining votes that could help Democratic Sen.

The U.S. Senate race is going to an automatic recount, requiring already exhausted election officials to reprocess seven million ballots in under two weeks.

Pennsylvania's Secretary of the Commonwealth talks about the U.S. Senate race recount, which is legally required because of the closeness of the vote between Sen. Bob Casey and David McCormick.