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She was defeated by fellow Republican Tom Schedler of Slidell, the Louisiana Secretary of State, who held the seat from 1996 to 2008, when he was term-limited by state law and succeeded by the Mandeville Republican Jack Donahue.
In 1978, Knox and then Louisiana Secretary of State James H. "Jim" Brown of Ferriday in Concordia Parish, running as Democrats, unsuccessfully challenged the reelection of freshman Democratic U.S. Representative Jerry Huckaby.
In 1975, Mills ran again for statewide office when Louisiana Secretary of State Wade O. Martin, Jr., stepped down to run unsuccessfully for governor against Edwin Edwards and State Senator Robert G. Jones of Lake Charles, son of former Governor Sam Houston Jones.