Nine months after its landslide win in the West Bengal assembly polls, the Trinamool Congress on Monday reaffirmed its dominance among urban voters as it made a clean sweep in the elections to four municipal corporations. The TMC retained control of Bidhannagar, Chandernagore and Asansol municipal corporations and wrested power in Siliguri from the CPI(M)-led Left Front. Both the vote share and the number of seats for the TMC in these civic bodies were much higher than the last election held in 2015.