Barack Obama's appearance on "The Daily Show with Jon Stewart" last nightmarked the first time a sitting president has been a guest on the Comedy Central program. It likely marked another first: the first time a president was called "dude" in a TV interview.

Obama said that administration official Larry Summers did a "heckuva job" on financial reform--and the President suggested his words were deliberately chosen to echo the language George W. Bush used to praise FEMA official Michael Brown during Hurricane Katrina. Stewart...