The merger of the KMT and People First Party (PFP) was thought to be certain, but a string of defections from the PFP to the KMT have increased tensions within the Pan-Blue camp. In 2006, due to the Pacific Sogo Department Store scandal, the pro-KMT Pan-Blue Coalition moved to impeach the President but failed to obtain the requisite number of votes in the legislature. This failure led to a "Down Ah-Bian" campaign, which sought to pressure the president to resign from office. The campaign began on 1 September 2006. Campaign organizers claimed that the first day of the strike attracted 300,000 people in Taipei, while the police estimated the number to be closer to 90,000. The "Down Ah-Bian" event was being led by activist and politician Shih Ming-te (施明德) as a peaceful sit-in around the capital, besieging the presidential residence. While the protests have been largely peaceful, there have been isolated incidences of violence associated with the campaign, including fist fights between Pan-Blue and Pan-Green (pro-DPP) legislatures. The "Up Ah-Bian" event was organized to counteract the "Down Ah-Bian" campaign. On 13 October 2006, the Pan-Blue Coalition attempted again to pass a recall motion against the ROC President Chen Shui-bian, which also failed to garner sufficient votes in the legislature. On 3 November 2006, prosecutors in Taiwan stated that they have enough evidence to indict Chen's wife on corruption charges in connection with her handling of a secret diplomatic fund. According to the prosecutors, while Chen would not be indicted while in office, there is a possibility that he would be indicted after he leaves office. National identity Roughly 84% of Taiwan's population descends from Han Chinese who migrated from mainland China between 1661 and 1895. Another significant fraction descends from Han Chinese who immigrated from mainland China in the 1940s and 1950s. But between 1895 and the present, Taiwan and mainland China have shared a common government for only 4 years. The shared cultural origin combined with several hundred years of geographical separation, some hundred years of political separation and foreign influences, as well as hostility between the rival Taiwan and China have resulted in national identity being a contentious issue with political overtones. Since democratization and the lifting of martial law, a distinct Taiwanese identity (as opposed to Taiwanese identity as a subset of a Chinese identity) is often at the heart of political debates. Its acceptance makes the