Being a coalition partner of the Congress at the Centre need not be a deterrent for Railway Minister Mamata Banerjee's Trinamool Congress to join hands with the BJP elsewhere. Konthoujam Sarat of the Trinamool Congress on Thursday won the Konthoujam by-election to the Manipur legislative assembly. It was the first election victory of the Trinamool Congress in the state. Last year, it had won five assembly seats in Arunachal Pradesh.