You keep asking for evidence, well here it is.

This is well documented picture of Barack Obama, President of the United States:



You will notice that he is wearing a white shirt. The color of white has a well known cultural meaning. Ill quote a source as my evidence here:

http://www.color-wheel-pro.com/color-meaning.html

White is associated with light, goodness, innocence, purity, and virginity. It is considered to be the color of
perfection.

So there you have it, reliable, undeniable proof that President Barack Obama is a good guy.