Defence minister Rajnath Singh (File photo) NEW DELHI: Defence minister Rajnath Singh will start campaigning for the BJP in poll-bound Assam from Sunday when he will address four rallies in Biswanath and Golaghat districts, sources said. Two of his rallies will be in tea gardens and one in Gohpur, a historical place connected with the Quit India movement. The defence minister will address a rally at Sadharu tea estate and another at Dafflaghur tea estate under the Biswanath constituency from where BJP candidate Pramod Borthakur is seeking re-election, the sources said. His third rally will be in Gohpur for BJP candidate Utpal Bora, who is contesting against Assam Pradesh Congress committee president and Rajya Sabha MP Ripun Bora.