(SUBHEAD) Amritsar: Aam Aadmi Party has got a big boost in Punjab. Senior Congress leader Lalli Majithia, former MP Professor Sadhu Singh's daughter Dr. Baljit Kaur and BSP state general secretary Gurbaksh Singh joined the Aam Aadmi Party at Amritsar today. AAP state president Bhagwant Mann and party's co-in-charge of Punjab affairs Raghav Chadha and Leader of Opposition Harpal Singh Cheema formally inducted all the leaders into the party.