Here are two somewhat (okay definitely) political sites I support:
Although their missions have strong political implications, I think they both seek to accomplish their goals through rigorous scientific research rather than someone's or some organization's personal dogma.
The first is a site connected to Al Gore's campaign to raise awareness and action related to global warming. I also put one of their logos on the side of my page.
The other is for the organization, Scientist and Engineers for America. Their stated mission is to "influence targeted elections at all levels of government to renew respect for evidence-based debate and decision-making in politics."
Check them out.