After a speech in New Mexico , McCain got out of the shower and was drying off when he looked in the mirror and noticed he was black from the neck up to the top of his head.
In sheer panic and fearing he was turning black and might have to give up his hopes to be president, he called his doctor and told him of his problem.

The doctor advised him to come to his office immediately. After an examination, the doctor mixed a concoction of brown liquid, gave it to McCain, and told him to drink it all.

McCain drank the concoction and replied, 'That tasted like bullsh*t!'

The doctor replied, 'It was. You were a quart low.