After the 2006 Thai coup d'état, that ousted Prime Minister Thaksin, and the installation of a military-backed government, Weng approached the opposite political camp, the pro-Thaksin "Red Shirts". After the fierce "Red Shirts" protests against the government from March to May 2010, and the bloody military crackdowns in April and May, Weng, alongside other Red Shirt leaders, surrendered to the police on 18 May and was arrested. On 1 December 2010, his wife Thida was made chairwoman of the UDD. Weng was released on bail terms on 22 February 2011. He was elected member of parliament on the winning Pheu Thai Party list in the 2011 election.