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Associated Press
FILE - In this Nov. 10, 2010 file photo, then-Hawaii Republican Gov. Linda Lingle is seen in her office at the Hawaii State Capital in Honolulu.  It's a once-in-a-generation occurrence: a competitive U.S. Senate race in Hawaii. And that's exactly what may be shaping up as two Democrats, Rep. Mazie Hirono and former Rep. Ed Case, square off in a primary Saturday. They're seeking the chance to take on former two-term Hawaii Gov. Linda Lingle in November. No matter which Democrat wins Saturday's primary, they'll face a tough fight from Lingle. The outcome could help determine the balance of power in Washington; Republicans need to gain four seats to take back control of the Senate.   (AP Photo/Marco Garcia, File)

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