FILE - This Aug. 8, 2014, file photo shows Wisconsin Gov. Scott Walker as he speaks at the Republican National Committee summer meetings in Chicago. Becoming a governor can take years of paying political dues and a grueling nomination battle. Once it’s gotten, keeping the power tends to be easier. Incumbents are tough to beat, particularly when the economy is on the upswing. That’s the case this year when 36 states pick governors. (AP Photo/Kamil Krzaczynski, File)
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