ROBERTS: So what if Senator Clinton defeats her husband, becoming the first woman nominee. Could you see yourself working to support the first woman nomination?

OBAMA: I'd have to think about that. I'd have to think about that, her policies, her approach, her tone.

ROBERTS: That's not a given?

OBAMA: You know, everyone in this party is going to work hard for whoever the nominee is. I think that we're all working for the same thing. and,...