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Melissa Gilbert, best known for playing Laura Ingalls Wilder in the 1970s television drama "Little House on the Prairie," has thrown her bonnet in the ring for a U.S. congressional seat.Gilbert, 51, who moved to Howell, Michigan, in 2013, said in a tweet on Monday that she was "excited to announce my run for U.S. Congress in Michigan's 8th. Please join me in my fight for working families."