So, Fred Thompson the actor plays a white supremest and the LA Times wonders if this will be a problem for Thompson:

So can “Law & Order” actor and former Sen. Fred Thompson (R-Tenn.) become the first presidential candidate with this credit? Thompson played a white supremacist, spewing anti-Semitic comments and fondling an autographed copy of “Mein Kampf” on a television drama 19 years ago.
His colleagues say that he was just an actor putting everything he had into playing the role of a charismatic racist, named Knox Pooley, in three episodes of CBS’ hit show “Wiseguy” in 1988. “Do you call Tom Cruise a killer because he played one in a movie?” asked show creator and writer Stephen J. Cannell.
But in the age of YouTube, this performance could raise an intriguing political question: How does a performer eyeing a presidential run deal with a video history that can be downloaded, taken out of context, chopped into embarrassing pieces and then distributed endlessly though cyberspace? Some conservative political blogs are already considering the problem.
“Not only do politicians have to worry about getting comfortable with a crowd and saying something that might be caught on tape,” said USC professor Leo Braudy, a pop culture expert, who has written extensively about film. “Now actors who have political aspirations will have to go through every single line of every part they played to make sure there’s nothing they need to explain or apologize for.”

There was no footage of Bush “fondling an autographed copy of ‘Mein Kampf'” but the left turned him into Hitler anyway. The left will demonize and ridicule or candidate no matter who we offer so I doubt it will have any impact in the race. As with Bush, the reality is far different from the caricature and that will be evident.