Commissioner Mark Wetjen announced his resignation from the Commodity Futures Trading Commission effective Aug. 28, nearly four years after he was confirmed by the Senate to serve on the regulatory agency. Wetjen joined the CFTC in October 2011 and was acting chairman from January-July 2014. He has not said what he plans to do next. Agricultural groups are expected to lobby for Wetjen’s successor to have some background in, or understanding of, farming and agribusiness, said Feedstuffs. Three commissioners have been appointed in the past three years, it said, and “none have the strong agriculture portfolio that provides the needed insight on CFTC, which greatly impacts U.S. commodity markets.”