USA Today: Jon Corzine abruptly resigned as chairman and chief executive of now-bankrupt MF Global Friday, four days after the brokerage collapsed in Wall Street's largest failures over his losing bet on European sovereign debt. The brokerage announced that Corzine, a former U.S. senator and ex-New Jersey governor who once headed Goldman Sachs, "will not seek" severance payments totaling an estimated $12 million.