DECEMBER 31--As if being linked to one high-profile criminal case weren't enough, President-elect Barack Obama's name may soon pop up in another federal prosecution, this one involving a massive Ponzi scheme (no, the other massive Ponzi scheme). In addition to the Rod Blagojevich pay-for-play probe, Obama could figure in the upcoming fraud trial of Norman Hsu, the disgraced Democratic fundraiser who was charged last year with operating a $60 million pyramid scheme.