Real-life politicians can be very meaty roles for actors. In recent memory, we have seen Daniel Day-Lewis and Gary Oldman win Oscars for playing US President Abraham Lincoln and British Prime Minister Winston Churchill, respectively. Actresses like Helen Mirren, Cate Blanchett, and Olivia Colman have also either won or been nominated for Oscars for playing various British queens, and Meryl Streep won her third Oscar for playing British Prime Minister Margaret Thatcher. While all those actors were just playing parts, there are some very notable actors who have decided to go into politics for real.
Source: Actors Who Got Into Politics