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In page Politics of Thailand:

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Thaksin refused to publicly answer the questions of the People's Alliance for Democracy (PAD), a large group of middle class Thais and a coalition of anti-Thaksin protesters led by Sonthi Limthongkul. Due to an inability to clear himself of the corruption allegations, Thaksin's regime fell apart during public protests led by PAD, which led to widespread calls for his resignation and impeachment.