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UNITED STATES - JULY 21: Sen. Susan Collins, R-Maine, heads to the weekly Senate Republicans' policy luncheon on Capitol Hill on Tuesday, July 21, 2015. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - JULY 21: Sen. Susan Collins, R-Maine, heads to the weekly Senate Republicans' policy luncheon on Capitol Hill on Tuesday, July 21, 2015. (Photo By Al Drago/CQ Roll Call)

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