Denver Broncos quarterback Peyton Manning (18) walks off the field in the second quarter of an NFL football game against the Houston Texans, Sunday, Sept. 23, 2012, in Denver. (AP Photo/Jack Dempsey)

Associated Press
Denver Broncos quarterback Peyton Manning (18) walks off the field in the second quarter of an NFL football game against the Houston Texans, Sunday, Sept. 23, 2012, in Denver. (AP Photo/Jack Dempsey)
Denver Broncos quarterback Peyton Manning (18) walks off the field in the second quarter of an NFL football game against the Houston Texans, Sunday, Sept. 23, 2012, in Denver. (AP Photo/Jack Dempsey)
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