Keselowski raced with with JR Motorsports in 2008 , and got his first win came June 7 , 2008 at Nashville Superspeedway . Keselowski re-signed with JR in 2008 , and got his first win came June 7 , 2008 at Nashville Superspeedway , overcoming Clint Bowyer after the final caution in the closing laps of the race .