A bipartisan group of lawmakers has asked the Obama administration to rethink plans to lower biofuel requirements in the Renewable Fuel Standard. Fifty-two members of the U.S. House of Representatives from 22 mostly rural states signed the June 26 letter. The legislators represent mostly farm states that benefit from the use of corn and other bioproducts in fuel. The letter comes in response to the Environmental Protection Agency’s plan, announced last fall, to cut the amount of ethanol and other bio-fuels that are required to be blended into the nation’s fuel supply. That move has been widely supported by the marine industry, which has lobbied heavily against the use of fuels of more than 10 percent ethanol.