DMK's Youth Secretary Udhayanidhi Stalin son of party chief MK Stalin on Sunday won his debut elections by winning the Chepauk-Thiruvallikeni constituency. Udhayanidhi defeated PMK's Kassali AVA by a margin of 69,355 votes. The DMK has been leading in over 150 seats out of 234 Assembly seats. Meanwhile, the ruling AIADMK has been leading in 80 seats.