Telangana Chief Minister K Chandrasekhar Rao, who is in Punjab to pay tributes to the soldiers killed in the Galwan Valley clash and the farmers who died during the anti-farm law stir last year, appealed to farmers' leaders to continue their agitation against the Centre until they get constitutional gurantees on support prices for crops. "Farmers can change governments," he said while exhorting them to unite for a nationwide agitation which he said he will join and support along with other opposition parties like the Aam Aadmi Party.