The launch of the NDA campaign for the Lok Sabha elections in Bihar will witness a political first: Bihar Chief Minister Nitish Kumar will share stage with Prime Minister Narendra Modi for a grand rally. The announcement by the Chief Minister at a party meeting on Sunday came in the backdrop of a strong opposition challenge led by Tejashwi Yadav for the state's 40 Lok Sabha seats. Over 20 parties, large and small, have so far joined the opposition camp.