Justin Doran has been so busy performing around the city this year that it's hard to pin down just one role that makes his work so outstanding. He was hilarious as a long-limbed Little League dad in Rounding Third at Stages and disturbing as the scary fantasy man of a lonely little girl's dreams in Mr. Marmalade, also at Stages. But as Senator Joseph Cantwell in Main Street Theater's production of Gore Vidal's The Best Man, Doran found fabulous new depths in a lowlife politician who wants to win at all costs. Taken as a whole, it's hard to imagine the past season without Doran. He gave Houston audiences a charming, sexy, smart and even vaguely disturbing reason to spend their hard-earned dough at the theater.