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.

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.

Dabe McCormick's staffers say the legal dispute will have no bearing on the outcome of the U.S. Senate race against incumbent Bob Casey,