I thought Bob Roberts was a brilliant satire of populism and could, slightly tweaked, apply just as easily to the left as the right.
Robbins and Sarandon are two more examples of folks who are too left for my taste, but whose work I've enjoyed, depending on the film.
If your views are informed by which celebrities subscribe to them, or if you boycott their work because of their views, you're intellectually lazy and should start reading heavily before you next vote. If you remember how.