Republican Party (United States) | Democratic Party (United States) | Australian Labor Party | Democratic Party | Socialist Federal Republic of Yugoslavia | Liberal Party of Canada | Liberal Party of Australia | Republican Party | Liberal Party (UK) | Social Democratic Party of Germany | Liberal Party | Nazi Party | New Democratic Party | Progressive Conservative Party of Canada | Democratic-Republican Party | Green Party | Democratic-Republican Party (United States) | Social Democratic Party | Progressive Conservative Party of Ontario | Conservative Party of Canada | Ontario Liberal Party | Communist Party | Communist Party of China | Okinawa | political party | Socialist Party | Republican Party (U.S.) | Labor Party | Federalist Party | Mass |
The House of Councillors by-elections were won by one LDP-Kōmeitō supported candidate (Aiko Shimajiri in Okinawa) as replacement for OSMP Councillor Keiko Itokazu, and one Democrat (Teruhiko Mashiko in Fukushima) as replacement for Democrat Yūhei Satō, producing a net gain of one seat for the ruling centre-right coalition three months before the regular House of Councillors election of 2007.