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?
Not a single color, but in Chinese tradition there were five colors of equal political significance corresponding to the Wuxing cycle of changes—black, red, cyan, white, and yellow. Each dynasty was associated with a color (with other associated traits), and was expected to be followed by one of two other colors (depending on whether the succession would be orderly or revolutionary).