GRETCHEN MORGENSON – “The game is rigged and the American people know that. They get it right down to their toes.†That’s Elizabeth Warren talking, the former consumer advocate and law school professor and now a Democratic senator from Massachusetts. I interviewed her about her new memoir, “A Fighting Chance,†in which she discusses one of America’s biggest challenges: how to level the playing field so that Main Street doesn’t always come second to Wall Street.