"Carson helped elevate the franchise here," Bengals coach Marvin Lewis said in the team statement. "He played at a very high level for us, and I wish him well with the Raiders. We obviously have a strong belief in the ability of Andy Dalton to continue playing well and to be the leader of our offense. He has been exceptionally effective for a rookie, and as good as he has been, we know he has tremendous potential to be even better."