Video footage of the incident showed Supriyo standing on the footboard of a vehicle and a stone landing on his chest.
West Bengal Chief Minister Mamata Banerjee on Thursday received wholehearted support from a group of women from the troubled Sandeshkhali area who met her after a Trinamool Congress rally in Kolkata, party sources said.
Over 86 lakh voters will decide the political fate of 284 candidates in this phase.