The Congress and its ally Trinamool Congress scored major victories in by-elections for one Lok Sabha and 31 assembly constituencies across seven states in which the biggest losers were the beleaguered Left and the Samajwadi Party.

Of the 10 assembly seats in Rajasthan, Himachal Pradesh, Assam, Kerala and Chhattisgarh, the Congress bagged eight. The Bharatiya Janata Party (BJP) got the remaining two.