EXCLUSIVE: Dylan McDermott has carved out time from his starring role in the FX hit series American Horror Story to join the cast of Dog Fight, the Warner Bros comedy that Jay Roach will direct this fall. McDermott will play Tim Wattley, a political consultant who runs the campaign of a candidate from South Carolina. Zach Galifianakis plays the candidate, and Will Ferrell and Jason Sudeikis reportedly will also star. Chris Henchy wrote the script. The film starts in November, but they’ve worked it out so McDermott can begin filming in early December. McDermott, who’s repped by CAA and The Schiff Co., most recently wrapped The Perks of Being A Wallflower and Nobody Walks.