Congress MP Shashi Tharoor on Friday asserted that he has a vision to strengthen the party which should be a vehicle for "change" as he filed his nomination for the party president poll.

Addressing a press conference after filing his papers, the former Union minister called his rival Mallikarjun Kharge, who is also contesting and is being seen as the favourite to win, 'Bhishma Pitamah' of the Congress.