Associated Press
FILE - In this May 22, 2010 file photo, former Hawaii Rep. Ed Case holds a sign as he campaigns in Honolulu.  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/Marco Garcia, File)

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