Mitt Romney

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Supporters reach out to Republican presidential candidate, former Massachusetts Gov. Mitt Romney as he arrives to campaign stop at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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A silhouetted Republican presidential candidate, former Massachusetts Gov. Mitt Romney steps off his campaign plane at General Mitchell International Airport in Milwaukee, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters as he campaigns at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves to supporters before speaking at a campaign event at Wisconsin Products Pavilion at State Fair Park, Friday, Nov. 2, 2012, in West Allis, Wisc. (AP Photo/David Goldman)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney gestures as he speaks at a campaign stop at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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Darla Flemming from Greenfield, Wis., wearing a cheesehead hat waits for Republican presidential candidate, former Massachusetts Gov. Mitt Romney at a campaign stop at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney smiles as he speaks during a campaign event at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney gestures as he speaks at a campaign event at Wisconsin Products Pavilion at State Fair Park, Friday, Nov. 2, 2012, in West Allis, Wis. (AP Photo/David Goldman)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves to supporters as he arrives for a campaign stop at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)

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Supporters gesture as they chant "four more days" in reference to the upcoming election as Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign event at Wisconsin Products Pavilion at State Fair Park, Friday, Nov. 2, 2012, in West Allis, Wis. (AP Photo/David Goldman)

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Supporters cheer as Republican presidential candidate, former Massachusetts Gov. Mitt Romney takes the stage for a campaign event at Wisconsin Products Pavilion at State Fair Park, Friday, Nov. 2, 2012, in West Allis, Wis. (AP Photo/David Goldman)

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Luke Frank, 6, and his brother Zachary, 8, right, from Grafton, Wis., wearing Romney cheeshead hats, listen as Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at the Wisconsin Products Pavilion at State Fair Park in West Allis, Wis., Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)