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UNITED STATES - AUGUST 14:   Sen. Chuck Grassley, R-Iowa, addresses the Lincoln Day Dinner hosted by the Black Hawk County Republican Party in Waterloo, Iowa.  Republican presidential candidates Texas Gov. Rick Perry, Rep. Michele Bachmann, R-Minn., and Rick Santorum, addressed the gathering.  (Photo By Tom Williams/Roll Call)

UNITED STATES - AUGUST 14: Sen. Chuck Grassley, R-Iowa, addresses the Lincoln Day Dinner hosted by the Black Hawk County Republican Party in Waterloo, Iowa. Republican presidential candidates Texas Gov. Rick Perry, Rep. Michele Bachmann, R-Minn., and Rick Santorum, addressed the gathering. (Photo By Tom Williams/Roll Call)

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