Gujarat, where the BJP and Congress are locked in a intense battle, goes to assembly polls in two phases on December 9 and December 14.
Congress general secretary in-charge for Maharashtra Mohan Prakash said Sinha echoed what the opposition in the state had been saying and that his agitation "exposed" the ruling party's claims with regard to farm issues, including the loan waiver scheme.
Sinha, who raised the issue of the government's alleged apathy towards cotton and soybean cultivators along with hundreds of farmers, was detained two days ago. Sinha was released reportedly a few hours after he was detained.
Former Union finance minister Sinha called of his three- day protest today.
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"A senior leader like Sinha was sitting there, showing mirror to the government. It exposed the government's claim and the BJP's face on the issue of loan waiver. And where are the prime minister and Amit Shah now?" Mohan Prakash asked.
The Congress leader also hit out at the state's Devendra Fadnavis dispensation over reported deaths of farmers from suspected pesticide poisoning in Vidarbha region.
He accused the state government of not clearing air yet about the type of chemical that was used in the pesticides.
"It has been three months that the pesticides killed human beings instead of insects. Yet the government has not told us which chemical it was? The bogus pesticides and seeds cannot be sold without the government's help," he alleged.