The campaign bus carrying Republican presidential candidate and former Massachusetts Gov. Mitt Romney passes by campaign signs for rival GOP candidate, former Pennsylvania Sen. Rick Santorum, en route to a campaign stop at the San Marino Club, Saturday, Feb. 25, 2012, in Troy, Mich. (AP Photo/Eric Gay)

Associated Press
The campaign bus carrying Republican presidential candidate and former Massachusetts Gov. Mitt Romney passes by campaign signs for rival GOP candidate, former Pennsylvania Sen. Rick Santorum, en route to a campaign stop at the San Marino Club, Saturday, Feb. 25, 2012, in Troy, Mich.  (AP Photo/Eric Gay)
The campaign bus carrying Republican presidential candidate and former Massachusetts Gov. Mitt Romney passes by campaign signs for rival GOP candidate, former Pennsylvania Sen. Rick Santorum, en route to a campaign stop at the San Marino Club, Saturday, Feb. 25, 2012, in Troy, Mich. (AP Photo/Eric Gay)
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