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FILE - In this June 3, 2014 file photo Iowa Republican Senate candidate Joni Ernst speaks in Des Moines, Iowa. 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/Charlie Neibergall, File)

FILE - In this June 3, 2014 file photo Iowa Republican Senate candidate Joni Ernst speaks in Des Moines, Iowa. 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/Charlie Neibergall, File)

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