The political temperature in Bihar is set to go up substantially as Prime Minister Narendra Modi and Congress leader Rahul Gandhi take a direct plunge in electioneering Friday, addressing a series of rallies for their respective alliances in the state. Prime Minister Modi will address three rallies – at Dehri-on Sone (Rohtas district), Gaya and Bhagalpur — to seek support for NDA nominees on different assembly constituencies going to vote in the first phase on October 28. According to BJP sources and reports from the districts Thursday, Bihar Chief Minister Nitish Kumar will join Modi at the rallies in Dehri and Bhagalpur. In Gaya, JD(U) leader in the Lok Sabha Rajiv Ranjan Singh Lallan will share the dais with Modi along with former chief minister and president of Hindustani Awam Morcha Jitan Ram Manjhi. Congress leader Rahul Gandhi is also slated to launch his campaign in Bihar elections Friday. He will address two rallies Friday — at Hisua in Nawada and Kahalgaon in Bhagalpur district.