A little on the side

After spending a night at a hotel with a prostitute, the politician took $300 out of his wallet and placed it on the
dressing table.

"Thanks," she said. "But I only charge $20."

"Twenty bucks for the entire night?" the amazed politician replied...
"You can't make a living on that."

"Oh, don't worry," the girl replied. "I do a little blackmail on the side!"