http://deregnochristi.org/2007/11/12/a-drc-presidential-endorsement/ if it's hard to understand why, please ask and I'll explain. -SolutionX
It's a group of Reformed Presbyterian Church (of North America) Pastors, but not the actual entire denomination. Just some of them that decided to start a forum to talk about it, and now they are leaning towards Ron Paul. If they decide to make an endorsement. It's not something big like what's his name... Pat Robertson, but I know it's much more sincere and the result of intelligent debate. They are Protestant by general category, same as RP.
I don't know if they are, but 501(3)c charities cannot endorse political groups or candidates without losing their special tax status.