Posted by ESPN.com's Adam Rittenberg
I called Purdue the Big Ten's mystery team entering the season, and it's still hard to get a great read on the Boilers.
After pounding Toledo and giving away a game at Oregon, Purdue finds itself down 14 points at halftime to Northern Illinois at home. The Boilers offense has yet to score -- Purdue's lone touchdown came on an Aaron Valentin punt return -- and sophomore running back Ralph Bolden has been held in check (7 carries, 30 yards).
Purdue finished with just 74 first-half yards after scoring at will in its first two games. Northern Illinois has controlled the line of scrimmage with its run game, something the Boilers need to get turned around in a hurry.