BALTIMORE -- Two days after winning the Super Bowl, the Ravens are apparently thinking about another.
There have been eight teams who have repeated as Super Bowl champions: Packers, Dolphins, Steelers (twice), 49ers, Cowboys, Broncos and Patriots. But it hasn't happened since the Patriots did it in the 2003 and 2004 seasons.
Nowadays, it's a challenge for reigning Super Bowl champions to get back to the postseason. Of the past four champions, two didn't make the playoffs the next season (Steelers in 2009 and Giants in 2012).