Fred Wertheimer is a long-time advocate for tighter controls on political money.

NPR: Internet Covered by Campaign Finance Laws

"In all of these cases, the groups were claiming (c)(4) status basically for the purpose of hiding their donors, " said Democracy 21 President Fred Wertheimer.

WSJ: Best of the Web Today

"Organizing for Action is unlike any entity we have ever seen before tied to a president, " said Fred Wertheimer, a campaign finance reform advocate with Democracy 21, a Washington nonprofit.

NPR: Obama Outside Groups Forming Influence Network