Introduced by his sons, Republican presidential candidate, former Massachusetts Gov. Mitt Romney makes a surprise appearance at a Colorado Conservative Political Action Committee (CPAC) meeting in Denver, Thursday, Oct. 4, 2012. At left is son Matt Romney. (AP Photo/Charles Dharapak)

Associated Press
Introduced by his sons, Republican presidential candidate, former Massachusetts Gov. Mitt Romney makes a surprise appearance at a Colorado Conservative Political Action Committee (CPAC) meeting in Denver, Thursday, Oct. 4, 2012. At left is son Matt Romney. (AP Photo/Charles Dharapak)
Introduced by his sons, Republican presidential candidate, former Massachusetts Gov. Mitt Romney makes a surprise appearance at a Colorado Conservative Political Action Committee (CPAC) meeting in Denver, Thursday, Oct. 4, 2012. At left is son Matt Romney. (AP Photo/Charles Dharapak)
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