As I suspected, the "Hillary raised $10 million online overnight" report that the Washington Post ran with earlier today was too good to be true. I don't know if the mistake is the reporter's or if someone at Camp Hillary was spinning a bit too fast, but there's no way they raised that much since her win in Pennsylvania yesterday.
An email from Terry McAuliffe, Clinton campaign chairman, that I received three hours ago, says "More than 50,000 people have contributed to the campaign for the very first time in the last 24 hours alone." If 80% of Clinton's donations are from new givers, that implies a total number of about 60,000 donations. If we're very generous and assume an average donation of $100, which is high for first-time donors, that gives Clinton a current take of at most $6 million.