From Kevin Spacey to Will Ferrell, Hollywood's leading men have all taken on the coveted role of the President of the United States. Click through to see which A-listers have portrayed our head of state here.
Giamatti starred as the titular character, John Adams, in the 2008 HBO miniseries. The actor later starred as King John in 2011 Ironclad and told Time Out Boston in March 2011, "That's what I look for — crappy world rulers. They were both really bad at their jobs. So I'm not sure, I think John Adams is a step down from King John, actually."