By Kirk Kern The last two years, the Raiders have had the luxury of having an established, veteran backup quarterback in Marcus Mariotta. This year, if starter Derek Carr were to suffer an injury, the team will have to hand over the reins to either Jarrett Stidham or Nick Mullens. In Thursday’s first pre-season game, the Hall of Fame Game in Canton, Ohio, Stidham and … [Read more...] about Raiders get chance to look at backup QBs