Bobby Rahal, co-owner of Rahal Letterman Lanigan Racing with David Letterman and Mike Lanigan, provided a preview of the upcoming 2017 Verizon IndyCar Series season that will kick off with the Firestone Grand Prix of St. Petersburg, March 10-12.  The team has entered the No. 15 Steak ‘n Shake Honda for Graham Rahal.  The race…