Congress on Saturday released fourth list of candidates for Lok Sabha elections. The list includes UP Congress President Ajay Rai, who will contest from Varanasi against PM Narendra Modi. PM Modi will contest elections from Varanasi for the third time. Congress leader Digvijaya Singh will contest from Madhya Pradesh's Rajgarh. The list also includes P Chidambaram's son Karti Chidambaram.