It came into existence after the Atal Bihari Vajpayee-led ND's defeat in the 2004 Lok Sabha elections. At that time Congress was only seven seats ahead of the BJP so to keep the BJP out, the Congress party, communist leader Harikishen Singh Surjeet, and CPM general Secreaty brought together 14 parties--RJD, DMK, TRS, AIMIM, PDP, IUML, RPI (G), KC(J), RPI(A), PDP, NCP, PMK, JMM, MDMK for the post-poll alliance with the Congress.