Last night Jon Heder, star of Napoleon Dynamite, hosted “Saturday Night Live.” I caught a few of the sketches he played in, and one thing was pretty clear: the kid’s no Philip Seymor Hoffman. He’s amiable and sweet-faced, to be sure, but there’s a muddiness to his voice he can’t seem to clear, and his mouth, for all its soft pliability, is suprisingly unagile with dialogue. I haven’t seen his latest effort, a supporting role in the romantic comedy Just Like Heaven, but in my judgment he doesn’t have either the chops or the charisma to make a career of movie-acting. It’s too bad, because he seems like a genuinely good kid, and Napoleon earned him a ton of celebrity-capital among an important demographic; he might have been the really big, genuinely Mormon star we haven’t had yet. I just hope the boy has managed to keep clean in Hollywood and New York; those are pretty muddy straits for a squeaky-clean BYU boy.