Carey Mulligan turns down the role of Hillary Clinton in "Rodham."

But why? Care to speculate? Maybe a young actress who's been successful at playing glamorous when she's not clearly beautiful should refrain from having her image defined by a famous character who's only reasonably nice looking. This is quite different from the situation where the actress is undeniably beautiful and the character being played is actively homely — like Charlize Theron in the movie that won her an Oscar.