If you wanna make a "the RNC and DNC are subject to FOIA" rule, fine. This isn't how you accomplish it. It wasn't an investigation of the DNC; it was an investigation of Rich's murder, of which there's zero evidence of DNC involvement.

A standard of "if you're the victim of a crime, your personal info is fair game to anyone who wants it" would be a very, very dangerous precedent to set.