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In page Ronnie Bradford:

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Ronnie Bradford played college football for the University of Colorado. During his sophomore year, he blocked an extra point in Colorado's 10-9 victory over Notre Dame in the 1991 Orange Bowl to help Colorado win a share of the National Championship in the 1990 college football season (Colorado shared the National Championship in 1990 with Georgia Tech). That blocked extra point by Bradford was the difference in that football game.