At a rally near 'Lalu More', a crossing named after him, in Rajauli in Nawada, Prasad asked the poor, backward, dalits and minority people to unite against the "communal forces" to save the country.
Prasad did not make any comment on the tie up with Congress. However, while starting for the rally from Patna, he told reporters: "Let Congress do whatever it wants on alliance. I am starting campaign for my party."
"It is this person on whom former Prime Minister Atal Bihari Vajpayee had said he was ashamed of him. It is the same person to whom the US did not give visa. And today he wants to become the prime minister. Seeds of communalism are being sown all around by him," he said at the rally.
The RJD president also did not spare his bete noire, state Chief Minister Nitish Kumar.
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"Corruption and bribery are rampant in Nitish Kumar's rule. Police station, block and district level offices are plagued with corruption," he said.
In an effort win the support of the masses, he sought "forgiveness" from the people "if my party leaders had ever done anything against you" and assured them that such things would not be repeated.
Seeking to puncture Modi's claim of selling tea in childhood, Prasad said actually it was he who had sold tea in childhood to sustain studies.
Earlier, he unveiled a bust of socialist leader Jagdeo Prasad at Targir village in the district.