We don't know how much of his net worth is liquid enough for that, but he would be silly to risk his left over money, knowing his record of recent years. Also, his net worth is having a 90% downdraw right now...
Granted, you may not agree with those people or share their sentiment...but I think @freedinner is spot on in describing the thought processes and decision making of that crowd. It's just like giving to The Clinton Foundation (or CGI, or whatever they're calling their racket these days), as many of them do...just with an upside!
Guys like Corzine don't trade. They build Organizations that trade. They use their clout and managerial skills to raise funds and hire talent and give that talent a platform to produce returns.