"Wow, well done #Delhi & well done @AamAadmiParty.Good luck to @ArvindKejriwal for the next 5 years," the National Conference Working President tweeted.
"If there is lesson for the #Congress in this it is that Modi & BJP aren't unbeatable if you take the fight to them, don't wait for mistakes," he added.
On the political deadlock in Jammu and Kashmir, the former chief minister said the BJP and the PDP should now form the government in the state.