Julius Caesar was assassinated for wearing red boots. Barrack Obama was lambasted for wearing a tan suit. Purple is associated with royalty, white is associated with clergy, and gold is associated with superiority. Red and Blue have powerful meanings in America, and so does Green. Which colour is the most political in your opinion?
Fun fact: the flag of Jamaica is the only country flag which has neither red, white or blue.
The old flag of Lybia fit that category as well.