Peyton Manning

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Denver Broncos quarterback Peyton Manning (18) reacts to a call during the first half of an NFL preseason football game against the Seattle Seahawks, Thursday, Aug. 7, 2014, in Denver. (AP Photo/Joe Mahoney)

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Denver Broncos quarterback Peyton Manning (18) signals at the line of scrimmage during the first quarter of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 17, 2014. (AP Photo/Marcio Jose Sanchez)

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Denver Broncos quarterback Peyton Manning will join Sen. Rand Paul and other GOP heavyweights at Mitt Romney's upcoming leadership summit. (Associated Press)

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Denver Broncos quarterback Peyton Manning talks to the media following an NFL football organized team activity, Wednesday, May 28, 2014, in Englewood, Colo. (AP Photo/Jack Dempsey)

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Denver Broncos quarterback Peyton Manning talks to the media following an NFL football organized team activity, Wednesday, May 28, 2014, in Englewood, Colo. (AP Photo/Jack Dempsey)

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Denver Broncos quarterback Peyton Manning stretches during an NFL football organized team activity, Wednesday, May 28, 2014, in Englewood, Colo., (AP Photo/Jack Dempsey)

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Denver Broncos quarterback Peyton manning throws during an NFL football organized team activity, Wednesday, May 28, 2014, in Englewood, Colo., (AP Photo/Jack Dempsey)