Wis. Senate race most expensive in state's history

Wisconsin's fight over who will replace retiring Democratic Sen. Herb Kohl is already the most expensive Senate race in the state's history.

The latest poll results from Marquette University Law School show a dead heat with former Gov. Tommy Thompson polling at 46 percent and Rep. Tammy Baldwin at 45 percent. New numbers will come out Wednesday.

Is the neck-and-neck Senate race having any affect on Wisconsin's presidential vote?

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