Penske's Keselowski revels in his rabble-rousing role

Penske's Keselowski revels in his rabble-rousing role: "The hard feelings from their on-track feud in the final weeks of the 2009 campaign may have stretched into the offseason, but that didn't stop Brad Keselowski from sending rival Denny Hamlin a Christmas card. The message on the front was simple: Peace on earth. The personal note on the inside was laughable: 'Your friend, Brad Keselowski.'"