Gov. Terry Branstad may have been “using a little hyperbole to make a point” when he suggested lowering renewable fuel standards could lead to a return to the “bad old days” of the farm crisis, Sen. Tom Harkin suggested Thursday morning.However, the Iowa Democrat agreed with the point Republican Branstad was making: reducing the use of conventional biofuels would not be good for the Iowa farm economy.And, Harkin told reporters, Branstad is correct in not going along with the Environmental Protection Agency’s plans to lower the requirements for renewable fuel.Whether the governor is right that lowering the requirements for renewable fuel use is a bad idea, Harkin said the move would not be good for Iowa.“It’s not going to be good for the farm economy,” he said.