Got some spare time? Want to get involved in a little open source watchdogging project? Our friends at the Center for Responsive Politics are asking users to research a list of "mystery PACs," or leadership political action committees that appear to be affiliated with a member of Congress but do not explicitly say so. Leadership PACs do not have to disclose the identity of an affiliated member of Congress. There's a bill in Congress, HR 347, sponsored by Rep. Walter Jones (R-NC), that would end this secretive process. While we wait for this bill to get a hearing in the House you can research these PACs yourself. If you need a little help in getting started, Bill Allison, at the Real Time Investigations blog, writes up a good summary of how he researched one of mystery PACs. And if you're feeling in a good mood and want to contribute your findings to another resource, Congresspedia has a great page on political action committees that lists many of the leadership PACs currently active. Feel free to add your findings to the list. Definitely go and help out CRP uncover the members of Congress behind these mystery PACs.