President Barack Obama reads a document while en route to Pittsburgh International Airport in Pittsburgh, Pa., Oct. 11, 2011. (Official White House Photo by Pete Souza)
This is the NFL logo on the field at Heinz Field before an NFL football game between the Pittsburgh Steelers and the Baltimore Ravens, Sunday, Nov. 2, 2014, in Pittsburgh. (AP Photo/Gene J. Puskar)
Pittsburgh Penguins' Olli Maatta (3), of Finland, warms up before the NHL hockey game between the Pittsburgh Penguins and the Anaheim Ducks on Thursday, Oct. 9, 2014 in Pittsburgh. (AP Photo/Keith Srakocic)
Pittsburgh Steelers quarterback Ben Roethlisberger (7) acknowledges the crowd as time runs down in the fourth quarter of the NFL football game against the Indianapolis Colts, Sunday, Oct. 26, 2014 in Pittsburgh. (AP Photo/Don Wright)
As a tribute to the victims of the Ottawa shootings, the national anthem of Canada is sung before an NHL hockey game between the Pittsburgh Penguins and the Philadelphia Flyers in Pittsburgh, Wednesday, Oct. 22, 2014. (AP Photo/Gene J. Puskar)
Heinz Field in Pittsburgh plays host to the NHL Winter Classic outdoor hockey game between the Pittsburgh Penguins and Washington Capitals in Pittsburgh, Saturday, Jan. 1, 2011. (AP Photo/Gene J. Puskar)
Carolina Panthers quarterback Cam Newton (1) walks around the edge of the field during warmup before the NFL preseason football game against the Pittsburgh Steelers Thursday, Aug. 28, 2014, in Pittsburgh. (AP Photo/Keith Srakocic)
Pittsburgh Penguins' Brooks Orpik (44) skates in the first period of an NHL hockey game between the Pittsburgh Penguins and the Tampa Bay Lightning in Pittsburgh, Saturday, March 22, 2014. (AP Photo/Gene J. Puskar)
Olympic women's gymnastics champion Gabrielle Douglas answers questions during an interview Monday, June 23, 2014, in Pittsburgh. Douglas is hoping to return to competition at the USA Gymnastics national championships in Pittsburgh in August. (AP Photo/Keith Srakocic)
Washington Capitals' Alex Ovechkin (8) plays in the NHL Winter Classic hockey game between the Pittsburgh Penguins and the Washington Capitals in Pittsburgh, Saturday, Jan. 1, 2011 . (AP Photo/Keith Srakocic)
Pittsburgh Steelers safety Mike Mitchell, center, goes through drills with the defense during an NFL football organized team activity on Thursday, May 29, 2014 in Pittsburgh. (AP Photo/Keith Srakocic)
Pittsburgh Steelers safety Mike Mitchell, (23) goes through drills with the defense during an NFL football organized team activity on Thursday, May 29, 2014 in Pittsburgh. (AP Photo/Keith Srakocic)