Baltimore Ravens

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Baltimore Ravens quarterback Joe Flacco celebrates running back Bernard Pierce's touchdown during the second half of an NFL football game against the Cleveland Browns in Baltimore, Md., Sunday, Sept. 15, 2013. (AP Photo/Patrick Semansky)

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Baltimore Ravens head coach John Harbaugh looks upward during the second half of an NFL football game against the Denver Broncos, Thursday, Sept. 5, 2013, in Denver. (AP Photo/Joe Mahoney)

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Denver Broncos quarterback Peyton Manning (18) calls a play against the Baltimore Ravens during the second half of an NFL football game, Thursday, Sept. 5, 2013, in Denver. (AP Photo/Jack Dempsey)

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Ravens quarterback Joe Flacco proved his worth in leading Baltimore to a Super Bowl title in February, and now he becomes more of a recognized leader with the retirement of linebacker Ray Lewis. (associated press)

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**FILE** President Obama poses with a personalized Baltimore Ravens football jersey with Ravens head coach John Harbaugh during a ceremony on the South Lawn of the White House on June 5, 2013, where the president honored the Super Bowl XLVII champs. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII in February. (Associated Press)

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Baltimore Ravens quarterback Joe Flacco (5) throws a pass as backup quarterback Tyrod Taylor watches during an NFL football training camp practice at the team's practice facility in Owings Mills, Md., Thursday, July 25, 2013. (AP Photo/Patrick Semansky)