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Gene J. Puskar, Associated Press
Penn State head coach Bill O'Brien yells from the sidelines during the first quarter of an NCAA college football game against Northwestern in State College, Pa., Saturday, Oct. 6, 2012.

STATE COLLEGE, Pa. — Quarterback Matt McGloin had the go-ahead score with a 5-yard touchdown run with 2:37 left and Penn State rallied from 11 points down in fourth quarter to beat No. 24 Northwestern 39-28 on Saturday.

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The Nittany Lions scored three times in the final 9:49, starting with McGloin's 8-yard touchdown pass to Allen Robinson as the receiver dragged along the back line of the end zone. Michael Zordich had a 2-point conversion run to get within 28-25 before McGloin's scramble into the end zone sent the homecoming weekend crowd into a frenzy.

Penn State (4-2, 2-0 Big Ten) then stuffed Northwestern's last-gasp drive after Trevor Siemian's pass for Kain Colter was tipped away on fourth down.

Things looked so good for Northwestern (5-1, 1-1) after Venric Mark's 75-yard punt return for a touchdown with 50 seconds left in the third quarter demoralized the blue-and-white faithful for a 28-17 lead.

Mark also ran for a score.