Please Explain: Chocolate

The Aztec king Montezuma drank liquid chocolate all day to enhance his libido. On today's Please Explain: which brands are tastiest, whether it has any real health benefits -- and why so many of us are addicted to it. Leonard talks to Clay Gordon, a chocolate critic who runs the website chocophile.com; and Dr. Ann E. Kelley, professor of psychiatry at the University of Wisconsin-Madison.