Screening charities for progressive-ness

So, my wife and I want to donate some of our money to charity.  We want to make sure we can avoid nice-seeming but evil charities that launder Republican  campaign contributions, deny contraception, promote unsustainable living, etc.  What's a good way to screen charities for "progressiveness"?  Is there a charity equivalent of buyblue.org?  buyblue doesn't seem to cover it (I couldn't find it on their site, anyway.)

I was going to make this an openthread comment but then I thought maybe other folks could use the info.  This is my first diary (though I've been "refreshing" dKos for about 2 years now), so let me know if I'm lame-ing out here, and I'll delete it.

Thanks!

jted