Of the $189 million spent so far by Super PACs, non-profits and labor unions to influence the 2010 mid-term elections, $97.5 million has come from groups that do not disclose any donors, an analysis of Federal Election Commission contribution records shows. That is, about 52 percent of the money spent so far on everything from political ads to phone banks to fliers promoting or opposing federal candidates has come from groups that don't disclose the sources of their funds.*   

Of the 218 non-party committees that have spent money on independent expenditures or electioneering communications, only 100 have disclosed ...