Congress General Secretary Janardan Dwivedi, at the same time, said "this kind of anarchy" cannot create an "ideal system".
In an apparent attack on BJP's prime ministerial candidate Narendra Modi, he said it was a "pity" that through "arm-twisting", a leader of a state had forced his leadership in BJP on others.
Cautioning that one who strays in politics is negated by people, he said the victory of Aam Aadmi Party in Delhi is not the victory of any party, leave aside ideology.
Emergence of AAP reflects the anger of the people towards the system: Dwivedi
"Those who have won here have no ideology. They have won because of the discontent among people. This is the victory of the anger of the people towards the major parties.
"This is the victory of the grievance of common residents from the system. This is a challenge, this is a warning. It should be accepted like that....I think all parties, including Congress, are realising this now," Dwivedi said.
Without naming Modi, he said he felt pity on BJP as a leader of a state had become such a "strongman" that by "twisting the arm of others", he forcibly declared himself the leader.
"It is not proper to say anything more on the internal affairs of another party or any leader," he said.
Dwivedi said the values of democracy and anti-communalism were alive in the country and the "the spirit of India is democratic and non-communal."
To questions about the failure of Congress in coming back to power in many states where it once ruled, Dwivedi said there were some problems in candidate selection, but the bigger problem was that "we did not try to create new leadership keeping in mind the entire society".