Agency, Varanasi :Launching a direct attack on Sonia Gandhi and Narendra Modi, Arvind Kejriwal on Tuesday accused the duo of having a tacit pre-poll understanding.The Aam Aadmi Party chief asked why the Congress president and the BJP’s prime ministerial candidate had refrained from campaigning in each other’s constituencies.While Sonia is contesting the 2014 Lok Sabha polls from Rae Bareli in Uttar Pradesh, Modi is fighting from two seats – Vadodara in Gujarat and Varanasi in UP. Kejriwal himself is a candidate from Varanasi.Taking up the Robert Vadra controversy, Kejriwal asked why has the BJP failed to register an FIR against Sonia Gandhi’s son-in-law despite levelling allegations against him.”We registered five FIRs against Sheila Dikshit in 49 days. Why can’t the BJP in Rajasthan register an FIR against Vadra?” he asked, as reported by a newspaper.Questioning the Congress-led UPA government’s sincerity, Kejriwal pointed out that the Centre had failed to arrest Modi in connection with the Snoopgate scandal.