Running for president means preening and maintain a careful appearance, but Mitt Romney was willing to open up to one outsider: Greg Whiteley, a director who spent six years filming him for the documentary Mitt. Netflix picked up the film last week, and today its premiering the first trailer. It includes a surprisingly personal look at Romney along the campaign trail — from him traveling between debates to him ironing a tuxedo that hes already wearing — and opens with a quiet and emotional moment on Election Day as he and his family come to realize that theyve lost the race. …