Diwali started off on an upbeat note on Tuesday for Karnataka's ruling Janata Dal Secular-Congress coalition which has pocketed four of the five seats where by-elections were held last weekend. The tally puts the BJP -- which as the prime opposition has been eyeing a chance to wrest power in the state -- on the backfoot, more so after the coalition partners wrested the Bellary Lok Sabha seat which the party has been winning since 2004.