In the 2004 general elections, the Congress alliance won the largest number of seats
and got an assurance of support from the Left Front upsetting the Atal Behari Vajpayee-led National Democratic Alliance, which was variously forecast to win outright victory or at least emerge as the largest alliance. Shortly thereafter, Sonia Gandhi was nominated by the Congress-led United Progressive Alliance to be the next Prime Minister. But in what was described as the dropping of a political bombshell, Sonia Gandhi refused to take the position based on her "inner voice". She backed eminent economist, former Union Finance Minister and senior Congress leader Dr. Manmohan Singh for the post of Prime Minister, and he was sworn-in as Prime Minister on 22 May 2004.