Some people say that I have no heart. I am here tonight to tell you that I do have a heart. I have the heart of a liberal…. It’s in a jar on my desk.
Sen. Phil Gramm
1992 Lincoln Dinner at the Middlesex Club in Waltham, Massachusetts
[Something very similar is also attributed to Colorado Sen. John Andrews. — Joe]
The earliest version of this I’ve heard was from the SF/horror writer Robert Bloch. From his biography at http://www.fantasticfiction.co.uk/authors/Robert_Bloch.htm :
…”Bloch is today most famous as the author of Psycho. He is also well-known for having said, ‘Despite my ghoulish reputation, I really have the heart of a small boy. I keep it in a jar on my desk.'”