Voters headed to the polls in India's capital Saturday, with firebrand former chief minister and Aam Adami Party (AAP) candidate Arvind Kejriwal looking to complete a surprise comeback and deliver the first major blow to Narendra Modi's premiership.

Less than a year on from his resignation as head of Delhi's state government after just 49 days in office, most polls say Kejriwal's anti-corruption party is set to push Modi's Hindu nationalist Bharatiya Janata Party (BJP) into second place when results are announced Tuesday.

The selection of Kiran Bedi as BJP's ministerial candidate has opened a can of worms, with many BJP activists furious at having to campaign for the 65-year-old who has a history of disparaging the BJP.