In a historic landslide victory, on August 30, 2009, Japan's largest opposition party, the Democratic Party of Japan (DPJ), ousted the main ruling party, the Liberal Democratic Party (LDP), in elections for control over Japan's Lower House of parliament. The LDP has had almost continuous control of the Japanese government since 1955 and has been a staunch supporter of the U.S.-Japan alliance throughout the postwar period. The DPJ, which includes a mixture of right- and left-leaning members and is led by Yukio Hatoyama, is now Japan's main ruling party.