It was recently announced that actress Julianne Moore has been cast to play former governor of Alaska, Sarah Palin, in the upcoming HBO film Game Change. The film follows John McCain's 2008 presidential campaign, from his selection of Palin as his running mate up until the very end where they lose to President Barack Obama.

The film is based on the book Game Change by John Heilemann and Mark Halperin. The film will be directed by Jay Roach and the script will be written by Danny Strong. The two will also serve as the film's executive producers. It has not been announced who will play the role of presidential-hopeful, John McCain. Here is a look at five actors that could fit the role.

1. Robert Duvall
It’s no secret that Robert Duvall is a Republican. The actor reportedly worked the floor at the GOP’s 2008 National Convention and also narrated a video that was shown there. Duvall also appeared at a campaign stop for John McCain in New Mexico. Reuters
2. Ed Harris
Ed Harris has experience playing the role of a presidential candidate. In 1992 he appeared in “Running Mates,” along with Diane Keaton. He also has the physical characteristics to play John McCain. Reuters
3. Steve Martin
Steve Martin may be known as a funnyman but he is another actor that could pull off portraying John McCain. Also, any presidential race involving a man named “Joe the Plumber” becoming a national sensation calls for some comedy. Reuters
4. Michael Hogan
Michael Hogan, known for his role in “Battlestar Galactica” is the ultimate doppelganger for John McCain. Hogan is known for his roles in “The Day the Earth Stood Still,” and his latest “Red Riding Hood.” Reuters
5. Martin Sheen
Martin Sheen is known for his epic role as Josiah Bartlett, President of the United States, in “The West Wing.” Even though John McCain lost the presidential race, Sheen has all the experience necessary for the part. Reuters
Barack obama Sarah Palin HBO