(SUBHEAD) Chandigarh: Aam Aadmi Party (AAP) Punjab got a major boost on Saturday when the media in-charge of Bhartiya Kisan Union (Lakhowal) Nachhatar Singh joined the party. Nachhatar Singh joined AAP in the presence of Aam Aadmi Party's Punjab chief ministerial candidate Bhagwant Mann and party's state general secretary Harchand Singh Barsat.