Steelers to start Dwyer, Mendenhall demoted to third string

After a disastrous offensive performance in a loss to the Browns, the Steelers appear to be shaking things up at running back. Ed Bouchette of the Pittsburgh Post-Gazette reports that Steelers coach Mike Tomlin has promoted Jonathan Dwyer to the starting running back position for Sunday’s game at Baltimore, and demoted Rashard Mendenhall — who…