"I was provided wrong feed back about the party organisation for which I feel sorry," Kumar said addressing workers meeting here as part of his "Sampark yatra."
"Coordination between the government and the party ensures proper implementation and monitoring of welfare programmes," he said in his speech.
JD(U) had bitten the dust in the Lok Sabha elections winning only two out of a total 40 seats in the state. In more than half of the seats, the party, which had entered the fray in alliance with CPI and CPI-M, lost its deposit.
"Now I am face to face with the party and people to seek their fresh mandate for completing the unfinished developmental work in Bihar," Kumar, who would be the face of the party in the Assembly poll next year, said.
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The JD(U) leader came down heavily on his former companion BJP and accused them of winning the general election on the basis of "false promises" and with the help of "media propaganda."
He charged the PM with failing to fulfil the promise made on the issue of return of black money into the country and providing one crore jobs to youth.
He said parties which had split from Janata Parivar with the help of Left parties would oppose "anti-people" policies of BJP government in Parliament.