My sense is that being a First Lady is a full-time job, but I'll know more when the time comes.

When I was younger, I could eat whatever I wanted, as long as I exercised; or if I didn't exercise and just watched what I ate, I'd maintain. Now I have to do both.

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.

When you walk through that door of opportunity you don't slam it shut behind you.

I come here tonight as a sister, blessed with a brother who is my mentor, my protector and my lifelong friend. And I come here as a wife who loves my husband and believes he will be an extraordinary president.

Clearly this is a tough economic time, and a lot of families are hurting. So when we talk to parents, we talk about small changes for kids and things that don't cost extra money. Like adding water and eliminating sugary drinks and sodas. That's going to save money right there. Or adding a few more vegetables.

Do not bring people in your life who weigh you down. And trust your instincts ... good relationships feel good. They feel right. They don't hurt. They're not painful. That's not just with somebody you want to marry, but it's with the friends that you choose. It's with the people you surround yourselves with.