Big Money Makes a Big Comeback in Race for Democratic Nomination

(Bloomberg) -- Joe Biden, Bernie Sanders and Elizabeth Warren and Pete Buttigieg have all touted the depth and breadth of their grassroots support and modest size of their average donation, but contributors writing big checks dominated fourth-quarter financial reports.The shift comes as the Democratic National Committee on Friday adopted new rules for earning a spot in its debates, dropping a requirement that candidates develop a broad donor base. Now, candidates need only to reach 10% in four a