I don't think Ben Affleck should be on the poll choices. He's actually smart, even according to the NYDN list, which names him 50th among the 50 smartest people -- that means there are hundreds and hundreds of Hollywood people he's smarter than.
I don't think of Brad Pitt as dumb, either.
And a lot of those other people seem to be people who've made foolish mistakes or bad career choices, but aren't necessarily dumb. For example, I don't think of Alec Baldwin or Russell Crowe as dumb.