Shashi Tharoor has collected the nomination form as the process to elect the next Congress chief officially begins. It is likely to be a contest between Congress MP Shashi Tharoor and Rajasthan Chief Minister Ashok Gehlot for the Congress head post after Rahul Gandhi said he will "stick to his decision" of not contesting the poll. The window for filing the nomination papers begins today, September 24. Candidates can file their nominations till September 30.