Arvind Kejriwal is a giant killer, he ensures a spectacular (personal, team) defeat for Sheila Dixit as the Aam Aadmi Party (AAP) is projected to win 28 seats (BJP 31, Congress 8, Others 3) in Delhi. BJP fails to get an outright majority (even with presumed support of independents).
Corruption in politics is supposed to be a great leveler, “they all do it”, “it is not our fault that we have corrupt (coalition) partners” and “my corruption good, yours bad” are popular excuses (which sometimes even reflects the truth). However this is a rare occasion that a party formed out of nothing goes somewhere so fast. The things to watch are a) does AAP have any lasting power (anti-corruption is pro-poor but not in an obvious manner), b) will AAP eventually (and inevitably) get stained in order to remain viable, and c) status of the Jan Lokpal (corruption ombudsman) bill that is currently stalled in the Parliament.
I hesitate to say that this is an (almost) victory for the “middle class non-sectarian left” but IMO this is a landmark event in Indian politics. A few other milestones (no equivalence presumed) that come to mind are the Telugu Desam victory under the baton of NT Rama Rao, the coming to power of Mayawati in UP and the defeat of the Marxists in West Bengal.