One key for the Blue Devils against Northwestern will be limiting big plays. Chronicle pregame: Duke football vs. Northwestern Before Duke takes on Northwestern Saturday at noon at Wallace Wade Stadium, The Chronicle's Hank Tucker and Mitchell Gladstone discuss what Duke needs to do to get over the hump and beat Northwestern. 0:34—What will it take for Duke to be able to finally crack Northwestern's defense? 1:48—Will the Blue Devils' receivers take the next step? 2:40—Can Duke shut down the statistically most elusive running back in the country? 3:40—How does the Blue Devils' secondary match up with Clayton Thorson? 4:45—The Blue Devils are home underdogs. Could that bode well for them? 5:10—The biggest key to the game is....?