Holding banners and placards as well as brooms, the AAP election symbol, party supporters said the formation of the AAP government in Delhi marked the beginning of a new era in politics.
"For the first time in the country, a truly people's government headed by Kejriwal has been formed. It is going to change VIP politics into people's politics," said AAP leader Arif Raza Masumi.
Mahender Singh, a school teacher and an AAP supporter, said it was a big day for Kejriwal fans.
"Now we will work hard with honesty to bring about changes in the caste-ridden politics in Bihar," he said.
Masumi said AAP workers also celebrated in several districts across the state. He said a large number of people were wanting to join the party in the state.