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<p>Republican presidential candidates, from left to right: Texas Gov. Rick Perry; former Pennsylvania Sen. Rick Santorum; former Massachusetts Gov. Mitt Romney; former House Speaker Newt Gingrich; and Rep. Ron Paul, R-Texas, participate in the South Carolina Republican presidential candidate debate in Myrtle Beach, S.C., Monday, Jan. 16, 2012. (AP Photo/Charles Dharapak, Pool)</p>

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Five for fighting at GOP debate
January 17, 2012 8:15 p.m.

Five for fighting at GOP debate

Front-runner Romney fends off attacks

MYRTLE BEACH, S.C. (AP) - Under heavy debate pressure from his rivals, Republican presidential front-runner Mitt Romney defended his record as a venture capitalist, insisted he bears no responsibility for attack ads aired by his allies and grudgingly said in campaign debate Monday night he might release his income tax returns this spring.