Patna, July 30 (ANI): The three major political parties in Bihar, JD (U), RJD and Congress on Wednesday sealed an alliance to contest the upcoming Assembly by-elections in the state. Addressing mediapersons in Patna, senior JD (U) leader Vashistha Narayan Singh said JD (U), RJD, Congress have decided to contest the upcoming by-polls in the state together. It has also been decided that the three parties will jointly campaign.