“I am a Medicare For All candidate. I support it. I will fight for it. Maura Sullivan and Stefany Shaheen don’t support it and won’t fight for it.” That’s Democratic congressional candidate Christian Urrutia’s message to NH-01 primary voters, and he hopes it’s enough to give him the edge in the crowded field for the Sept. 8 contest. At a press conference in Manchester Tuesday, Urrutia — an attorney and New Hampshire Army National Guard officer —…