Associated Press
FILE - In this Dec. 1, 2011 file photo, former Wisconsin Gov. Tommy Thompson greets supporters after formally launching his bid for U.S. Senate, at a manufacturing facility in Waukesha, Wis. Democrats have their thumbs heavily on Republican scales in Senate primaries in Missouri and Wisconsin this summer, hoping to tip the balance and improve their own chances of maintaining a majority in November.  The idea isn't as far-fetched as it might sound. (AP Photo/Dinesh Ramde, File)

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