At the end of the day, when it comes time to make that decision, as president, all you have to guide you are your values, and your vision, and the life experiences that make you who you are.

I want to feel like the things I did made a difference. That's one of the reasons I spend time greeting people on rope lines, because I'm always thinking, 'Maybe this interaction, particularly if I'm meeting kids, will change someone's life.' That's how I think about the work I do as First Lady. It's a rare spotlight. I want to make sure I don't waste it.

Be passionate about something and lean to that strength.

I always want to be on the cusp of being in the best shape that I can be.

See, that's why Barack's running: to end the war in Iraq responsibly - to build an economy that lifts every family, to make sure health care is available for every American - and to make sure that every child in this nation has a world-class education all the way from preschool to college.

I'm not a big fan of young kids having Facebook. It's not something they need. It's not necessary.

We're all bombarded with so many dietary messages that it's hard to find time to sort through all this information, but we do have time to take a look at our kids' plates.