Trying To Follow The Money, It Ain't Easy.

This just in from the New York Times: Donor names remain secret as rules shift; Campaign finance watchdogs cry foul over anonymity given nonprofit groups :

The rule of thumb, in fact, is that more than 50 percent of a 501(c)(4)’s activities cannot be political. But that has not stopped Crossroads and a raft of other nonprofit advocacy groups like it — mostly on the Republican side, so far — from becoming some of the biggest players in this year’s midterm elections, in part because of the anonymity they afford donors, prompting outcries from campaign finance watchdogs.

A revamped regulatory landscape this year has elevated the attractiveness to political operatives of groups like Crossroads and others, organized under the auspices of Section 501(c) of the tax code. Unlike so-called 527 political organizations, which can also accept donations of unlimited size, 501(c) groups have the advantage of usually not having to disclose their donors’ identity.

“The Supreme Court has completely lifted restrictions on corporate spending on elections,” said Taylor Lincoln, research director of Public Citizen’s Congress Watch, a watchdog group. “And 501(c) serves as a haven for these front groups to run electioneering ads and keep their donors completely secret.”

Almost all of the biggest players among third-party groups, in terms of buying television time in House and Senate races since August, have been 501(c) organizations, and their purchases have heavily favored Republicans, according to data from Campaign Media Analysis Group, which tracks political advertising.

They include 501(c)(4) “social welfare” organizations, like Crossroads, which has been the top spender on Senate races, and Americans for Prosperity, another pro-Republican group that has been the leader on the House side; 501(c)(5) labor unions, which have been supporting Democrats; and 501(c)(6) trade associations, like the United States Chamber of Commerce, which has been spending heavily in support of Republicans.