Candidates' wives are supposed to sit cheerfully through their husbands' appearances.

Michelle Obama kind of has two identities. In private, she is actually often much more vehement than her husband about Republican opposition. It was very hard to get sources to put it on the record, but they would describe the way she talked about Republicans and opposition in private. And, you know, her remarks were scorching. The level of heat that she can give off in these conversations is often much greater than what Barack Obama does.

I would say that Barack Obama has always been a real optimist about what can be accomplished. He believes that government can be used to create systemic, long-term, real change. And the first lady is more of a skeptic.

Michelle Obama has mostly stuck to pretty anodyne topics. She's anti-childhood obesity, she's pro-veteran.

You make real progress when somebody is honest enough to say something that's really uncomfortable. Of course when you're a candidate's wife and when you're first lady and the first African-American first lady to boot, that is very, very hard to do.

Candidates' wives are supposed to sit cheerfully through their husbands' appearances.

Interpreting anyone's marriage - a neighbor's, let alone the president's - is extremely difficult.