A rolling billboard truck drives around Ford Field in Detroit as protestors march where Republican presidential candidate Mitt Romney delivered a speech to the Detroit Economic Club, in Detroit Friday, Feb. 24, 2012. (AP Photo/The Detroit News, Daniel Mears) DETROIT FREE PRESS OUT

Associated Press
A rolling billboard truck drives around Ford Field in Detroit as protestors march where Republican presidential candidate Mitt Romney delivered a speech to the Detroit Economic Club, in Detroit Friday, Feb. 24, 2012.  (AP Photo/The Detroit News, Daniel Mears)  DETROIT FREE PRESS OUT
A rolling billboard truck drives around Ford Field in Detroit as protestors march where Republican presidential candidate Mitt Romney delivered a speech to the Detroit Economic Club, in Detroit Friday, Feb. 24, 2012. (AP Photo/The Detroit News, Daniel Mears) DETROIT FREE PRESS OUT
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