Addressing the party's Sankalp Samabesh in Nabarangpur, the former JNU student's union president slammed the BJD as "BJP's D-team".
"BJD is the D-team of BJP. Elected representatives don't run the government in Odisha, friends of Naveen Patnaik do," he said.
Kumar also lambasted Patnaik for allegedly not being able to speak Odia properly.
"I am better than Patnaik as I can understand a little bit of Odia but he doesn't even know how to speak the language properly. The state needs Congress. I request you all to support the oldest party in the upcoming panchayat elections," he said.
Kumar came down heavily on the BJP-led government at the Centre, alleging that it spent Rs 5,000 crore on promotions, and many unemployed youths would have got jobs if that money was spent on them.
Party leader Jignesh Mevani called Odisha the "den of corporate loot".
Apart from Kumar and Mevani, Chhattisgarh Excise Minister Kawasi Lakhma, the party's Bihar in-charge Bhakta Das and Koraput MP Saptagiri Ulaka were present at the event.
BJD has not yet issued a reaction to Kumar’s allegations.
-With PTI inputs