Barack Billion Dollar Bill

I came up with an idea that if Barack Obama does become the President of the United States, should he be immortalized into some form of currency (dollars or cents)? I find it an interesting question because if they did decide to do so, whose to say they wouldn’t just make a commemorated coin or dollar bill that isn’t worth any real value. I doubt highly that the consensus would be to replace any other president in exchange for his face, but the way history has been, I feel very strongly that this question isn’t something thats on the minds of many. So I’m bringing to your minds!