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Strenuously lobbied to run by Takeo Fukuda, Oogi first elected to the House of Councillors as a member of the Liberal Democratic Party in 1977. She was voted out in 1989, but elected again in 1993. The following year she left the LDP and joined the Japan Renewal Party, which merged into the New Frontier Party on 10 December 1994. The NFP torn up on 31 December 1997, Oogi became a member of the Liberal Party, stringing along with Ichirō Ozawa.