Baltimore Ravens quarterback Joe Flacco (5) is lifted into the air by teammates after defeating the San Francisco 49ers 34-31 in the NFL Super Bowl XLVII football game, Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Bill Haber)
Baltimore Ravens linebacker Ray Lewis, left, and quarterback Joe Flacco celebrate their 34-31 win against the San Francisco 49ers in the NFL Super Bowl XLVII football game, Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Julio Cortez)
Baltimore Ravens quarterback Joe Flacco (5) celebrates with wide receiver Jacoby Jones (12) after throwing Jones a touchdown pass in the second quarter against the San Francisco 49ers during the NFL Super Bowl XLVII football game, Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Patrick Semansky)
San Francisco 49ers quarterback Colin Kaepernick (7) crosses the goal line for a touchdown as wide receiver Michael Crabtree (15) reacts in the fourth quarter of the NFL Super Bowl XLVII football game against the Baltimore Ravens, Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Dave Martin)
Baltimore Ravens wide receiver Jacoby Jones (12) celebrates his 56-yard touchdown with quarterback Joe Flacco (5) and Kelechi Osemele (72) during the first half of the NFL Super Bowl XLVII football game against the San Francisco 49ers, Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Dave Martin)
San Francisco 49ers tight end Vernon Davis (85) looks around a dark stadium after the lights went out during the second half of NFL Super Bowl XLVII football game Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Matt Slocum)
Baltimore Ravens quarterback Joe Flacco (5) passes against the San Francisco 49ers during the first half of NFL Super Bowl XLVII football game, Sunday, Feb. 3, 2013, in New Orleans. (AP Photo/Bill Haber)
The Superdome, where the NFL Super Bowl XLVII football game between the San Francisco 49ers and Baltimore Ravens will be played, is seen at sunset Friday, Feb. 1, 2013, in New Orleans. (AP Photo/Charlie Riedel)
NFL Commissioner Roger Goodell answers questions during an NFL Super Bowl XLVII football game news conference at the New Orleans Convention Center, Friday, Feb. 1, 2013. in New Orleans. (AP Photo/Gerald Herbert)
**FILE** Baltimore Ravens head coach John Harbaugh (left) and his younger brother, San Francisco 49ers head coach Jim Harbaugh, participate in a Feb. 1, 2013, news conference in New Orleans for Super Bowl XLVII. (Associated Press)