Pennsylvania's U.S. Senate race between three-term Democratic Sen. Bob Casey and Republican David McCormick will help determine control of the chamber.

With the eyes of the nation on the Presidential Election, the other big race to watch tomorrow is the contest for the U.S. Senate.

"What we're probably going to see is that whoever wins the presidency is also their party's candidate for the Senate will also be the winner," said Professor Ben Dworkin of Rowan University Institute for Public Policy and Citizenship.

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