Peter Morgan’s 2006 play Frost/Nixon — and, for that matter, the 2008 film version, directed by Ron Howard — starred Michael Sheen, who didn’t look much like David Frost, and Frank Langella, who didn’t look even slightly like Richard Nixon.
So I’m not too concerned that HBO has signed Julianne Moore to play Sarah Palin in a film adaptation of Game Change. Moore doesn’t look too much like Palin, but she does look like this:
And far be it from me to complain. (However, see the POH Diaries for an alternative choice.)