"While the national parties have not allowed growth of quality leadership in the state, governments fell due to some over-ambitious leaders," Mahto told reporters here.
Denying allegations that regional parties had plunged the state into political uncertainty, the former deputy chief minister said it was due to national political parties.
Mahto said the party would contest in all the 81 seats in the coming Assembly polls.
The current Hemant Soren-led government is the ninth in the state's 14 years of existence.