The IRS targeting of conservative groups is not the only problem at the agency. There is also the ongoing controversy about illegally providing taxpayer information to the White House political operatives.
http://www.wsj.com/articles/charles-lipson-congress-can-pry-open-a-clamm...
The Conservative Caucus is a public policy organization, contributions to which are not tax deductible. The IRS has determined TCC to be a 501(c)(4) organization, exempt from Federal income tax. TCC can receive corporate donations.