ATLANTA — An unlikely Senate duo — a conservative South Georgia farmer running for higher office and a liberal Atlanta preacher — have teamed up to help cannabis farmers with a bill allowing more hemp products in a state where marijuana remains illegal. Few people initially noticed their bill would have authorized a hemp derivative called Delta-8 THC, a product already sold in stores that gives users a recreational high. Retailers are selling Delta-8 under a federal hemp law that doesn’t specifically ban it. The Georgia bill got as far as the floor of the state Senate before opponents killed i…