Republican presidential candidate, former Massachusetts Gov. Mitt Romney, and his wife Ann Romney, greet children of campaign volunteers as they visited a campaign call center in Livonia, Mich., Tuesday, Feb. 28, 2012. (AP Photo/Gerald Herbert)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, and his wife Ann Romney, greet children of campaign volunteers as they visited a campaign call center in Livonia, Mich., Tuesday, Feb. 28, 2012. (AP Photo/Gerald Herbert)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, and his wife Ann Romney, greet children of campaign volunteers as they visited a campaign call center in Livonia, Mich., Tuesday, Feb. 28, 2012. (AP Photo/Gerald Herbert)
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