In the 2000 presidential election, Chen Shui-bian of the Democratic Progressive Party (DPP) was elected president with Annette Lu as vice-president. This was the first political party rotation in the history of the ROC. The splitting of Kuomintang vote was what apparently led to this result. In August 2002, President Chen openly indicated that the relationship between Taiwan and the mainland is "One Country on Each Side". This declaration led to disputations throughout Taiwan, in mainland China and in the United States. In 2004, the day before the 2004 presidential election, there was a supposed assassination attempt on President Chen and Vice-President Lu. They were re-elected the next day, although the Pan-Blue Coalition disputed the legality of the result due to the close margin of the election and the shooting incident. In 2005, an ad hoc National Assembly passed constitutional amendments ruling that elections for the Legislative Yuan change to use of parallel voting, aiding the formation of a two-party system. As a result of scandals in the DPP administration, on 9 September 2006, former chairperson of the DPP, Shih Ming-teh, led an anti-Chen Shui-bian campaign called the Million Voices Against Corruption, President Chen Must Go but did not achieve the desired result of President Chen's resignation.