Still not comfortable in his own skin

Former Clinton speechwriter Mark Katz calls Obama's humor "a work in progress."

Scary thought, that one. After the mentoring, the ghostwriting help, the re-reading of Saul Alinsky's "Rules for Radicals," the "skinny but tough" thing he uses as a talisman, the "let me be clear" tic that invariably introduces obfuscation, the famous aside about the price of arugula, and the utter inability to say anything even mildly self-deprecating -- our prickly president is still not comfortable in his own skin.