Please note that I know almost zero about this group, and I have NOT done the research on them yet*, but they certainly seem like a good idea. I was forwarded the info from Harry Reid's site, Give 'Em Hell, Harry, which seems like a decent endorsement. If someone else does know/has done the research, please let me know and I'll update this post!
*I make it a point to research any organization before giving them money. You should too. Too many fraudsters out there to do otherwise.