Bihar Chief Minister Nitish Kumar on Saturday said he is ‘a stumbling block’ for BJP's prime ministerial candidate Narendra Modi. “Modi thinks that I am a stumbling block for him,” he told mediapersons minutes before leaving on his election campaign. Nitish Kumar was speaking in reference to Modi who hit out against him at rallies in Sasaram and Gaya two days ago, and in earlier rallies in the state and outside. Modi accused the Nitish-led Government for going soft on terrorists and said that Bihar remained steeped in darkness.