A close look at donors who have collected large sums from hundreds of people to give to the presidential candidates makes it clear that Norman Hsu, the convicted thief who attracted attention last month for donating $850,000 to Hillary Clinton, is far from the only controversial figure to play a major fundraising role in campaigns. "All campaigns have the same problem, regardless of party or candidate: How do you know who has skeletons and who does not?" said Lanny Davis, who handled campaign finance issues for President Clinton from 1996 to 1998.
