Democratic U.S. Senate hopeful Elizabeth Warren is going back to California on May 21 for a big ticket fundraiser hosted by three of the Bay State's favorite sons. Actors Matt Damon, Ben Affleck and The Office's John Krasinski are hosting a $1,000 minimum donation event in the Harvard Law School professor's honor, as she takes on Republican U.S. Scott Brown is what is being billed as the most expensive Senate race in history. The event, called "A Massachusetts Evening," is being held on the rooftop of the Santa Monica building which houses Bad Robot Productions, a TV production company owned...