This Wall Street Journal editorial summarizes why Lois Lerner and the IRS are in trouble.
http://online.wsj.com/news/articles/SB1000142405270230391040457949004147...
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.