It's a complicated tale, but basically - this organization magically appeared with a bunch of right wing shills after the election and was chosen by congress to investigate the voting fraud 04 (something like that)... and they make up all these vote fraud accusations that are against Democrats and having nothing to do with the real vote fraud issues.
So why the heck would someone do that? It's like this.. suppose you're a casual observer as most people are, and you're asking someone "What's with all this voter fraud I keep hearing about? I hear there was voter intimidation and computer hacking."
Then, you're friendly neighborhood right-wing BS artist can say, "Well, look, we've got a panel of experts, hired by the US Congress investigating this - and what they've uncovered is far different from what you're saying.. they've uncovered..." bleh bleh bleh.
So Mr. John Doe is convinced that congress and the administration is doing a great job and the left wingers are just a bunch of tin-foil hat wearing Oliver Stoned conspiracy theorists.
You know?
Anyhow, the nitty-gritty takes some reading but it's described in detail by Brad Freidman of the bradblog - and it's worth at least a casual glance:
http://www.bradblog.com/ACVR.htm