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Associated Press
FILE - This Sept. 17, 2012 file-pool photo, then-Incumbent Rep. Frank Guinta, R-N.H., and his Democratic challenger Carol Shea-Porter debate during the 1st Congressional District forum at St. Anselm College in Manchester, N.H. Republicans in competitive races are treading gingerly around climate change this campaign season. Many say they are not in a good position to make a judgment about the issue, then voice concern for the environment, the economy or both. (AP Photo/The Union Leader, David Lane, File-Pool)

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