The IRS had back-up copies of the Lois Lerner emails going back ten years further than IRS officials claimed. Those with custody of the back-ups say that they were never asked to produce them.
http://www.washingtonpost.com/blogs/federal-eye/wp/2015/02/27/investigat...
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.