Here’s a lovely old Soviet joke, retold in the Washington Post about the waning of President Obama’s power.

Moscow, 1953. Stalin calls in Khrushchev.

“Niki, I’m dying. Don’t have much to leave you. Just three envelopes. Open them, one at a time, when you get into big trouble.”

A few years later, first crisis. Khrushchev opens envelope 1: “Blame everything on me. Uncle Joe.”

A few years later, a really big crisis. Opens envelope 2: “Blame everything on me. Again. Good luck, Uncle Joe.”

Third crisis. Opens envelope 3: “Prepare three envelopes.”