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FILE - In these Oct. 15, 2012 file photos, U.S. Sen. Sherrod Brown, D-Ohio, left, and Republican challenger, Ohio treasurer Josh Mandel, are shown during a debate at the City Club in Cleveland. Operators of an Ohio Super PAC behind more than $300,000 in independent advertising against Mandel have ties to Brown. Such ties break no election rules. However, Brown's campaign has roundly criticized a similar relationship between another outside group and Mandel's one-time staffer. (AP Photo/Tony Dejak)
Democratic U.S. Sen. Sherrod Brown speaks during the final debate against Republican challenger, Ohio state Treasurer Josh Mandel, at WCET studios Thursday in Over-the-Rhine, Ohio. (AP Photo/The Cincinnati Enquirer, Joseph Fuqua II)
Republican candidate for U.S. Senate, Ohio state Treasurer Josh Mandel, speaks during the final debate against Democratic U.S. Sen. Sherrod Brown at WCET studios Thursday in Over-the-Rhine, Ohio. (AP Photo/The Cincinnati Enquirer, Joseph Fuqua II)