Milky Turnips

Last night I dreamt that the next President of the United States of America will be Mr Mungbean Johnson.

I could dismiss this as the by-product of an overworked mind, but I have been thinking about this all day. The name Mungbean Johnson is somehow familiar, and I am sure that I have heard this name several times before. Just who is this mysterious person? Just who is Mungbean Johnson? Answers on a postcard please…