He will take over the reins of the party from his mother Sonia Gandhi, who steered it through success and failure for 19 years, the longest in the party's 132-year history, on December 16.
Mullappally Ramachandran, the chief of the Congress's central election authority, announced Gandhi's election today, the last day for withdrawal of nominations, when the 47-year- old leader, who appeared to have lately undergone a transformation-- from the tentative to the assertive--was busy canvassing for the party in Gujarat.
Prime Minister Narendra Modi congratulated Rahul Gandhi on his election even as the two are locked in a bitter political battle in Gujarat where assembly elections are on.
"I congratulate Rahul Ji on his election as Congress president. My best wishes for a fruitful tenure," Modi tweeted from his personal twitter handle @narendramodi.
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As expected, the Congress continued to rely heavily on a person with the Gandhi surname, to revive its dwindling fortunes despite losing state after state, with the exception of Punjab, since the 2014 Lok Sabha elections.
Rahul Gandhi's elevation comes close to five years after he was appointed party vice president in January 2013 and seemingly endless speculation about his impending promotion over the past couple of years after Sonia Gandhi started keeping indifferent health.
Rahul Gandhi, who appeared reluctant to take on the mantle of Congress president, gave clear indication about his readiness to accept the responsibility of running the party during an interaction at the University of California, Berkeley, in September this year.
While pageantry would herald the dawn of a new era in the Congress, which has ruled the country for over half-a-century since independence on December 16, the scion of the Nehru- Gandhi family will face the daunting task of restoring lost glory to the party whose fortunes have seen a downswing in the recent past.
Today, the party, which once controlled almost the entire country, has its governments in just five states and the Union Territory of Puducherry.
Striking a balance between the old guard and the young leaders would be key to running the organisation which has many seasoned politicians whose wisdom he could use as he steers the party through the choppy waters of current Indian politics.
Gandhi had said in the past that he would draw upon a blend of experience of the old and the energy of the young to helm the organisation.
The family was at the helm of the Congress's affairs after independence for at least 38 years: Jawaharlal Nehru for more than three years, his daughter Indira Gandhi and her son Rajiv Gandhi for eight years each, and Sonia Gandhi for a record 19 years.