Ever since 1947 when South Asians threw off the yoke of the British Raj, India has been dominated by the Congress party, led by the Gandhi family, with occasional interruptions from the Hindu nationalist Bharatiya Janata Party.

Now a new force in Indian politics has emerged that threatens to wreck the established order.

Late last year, the Aam Aadmi Party, a ragtag collection of political amateurs, crushed the Congress party in elections for the Delhi assembly.