The elder Hatoyama became the Democratic Party of Japan's chairman and leader of the opposition from 1999 to 2002, after which he resigned to take responsibility for the confusion that arose from rumors of mergers with Ichirō Ozawa's then Liberal Party. He was Secretary-General of the Democratic Party of Japan (DPJ) before he succeeded Ozawa as party leader following Ozawa's resignation on 11 May 2009. Hatoyama was chosen by fellow party representatives on 16 May 2009, winning 124 of the 219 votes and defeating rival Katsuya Okada.