using the money to buy ads and other such avocating media is illegal.  The date for doing that has passed.  Contributions now go to something called a "Legal Fund", whatever that is.  It seems that contributions to such a fund are not as well tracked as those that are contributed to a campaign fund.  So big contributors could have simply shifted where they are sending the money.  Also, the avocacy groups (not affiliated with the campaign but supporting the candidate 100%) on both the Republican and Democratic side appear to be flush with cash and are getting more.  There seem to be little constraint on such groups.