The marquee Senate race this year is in Massachusetts, where Democrat Elizabeth Warren is challenging incumbent Republican Sen. Scott Brown. "I never thought I'd run for public office, but I feel the urgency of this moment," says Warren. "If we don't make some important changes and make them soon, this country is going to change fundamentally, and it's not for the better." Democrats took notice of the former Harvard professor late last year, when a video of Warren speaking on fair taxation and debt surfaced online. "There is nobody in this country who got rich on his own. Nobody," Warren...