After RJD leader Lalu Prasad, his younger son and Bihar Deputy Chief Minister Tejaswi Yadav on Wednesday said Chief Minister Nitish Kumar was fit to be India's next prime minister."Nitish Kumar is an able chief minister. Bihar is developing under his leadership. He is honest and capable, so why can't he become the next prime minister?" Tejaswi Yadav told the media here.He said Nitish Kumar has been trying to unite all secular and non-BJP parties and would succeed in his mission.Earlier this year, Tejaswi Yadav had publicly stated that Nitish Kumar was his political guru and he was impressed by his commitment to develop Bihar.Lalu Prasad had on Tuesday backed Nitish Kumar as the next prime minister."I will be very happy if Nitish Kumar becomes the next prime minister," he had said.Lalu Prasad also called for a broader unity against the BJP and the RSS to defeat them in election -- like in Bihar last year.