Here's an excerpt from the bio of the guy who runs the site:
"Despite 35 years living in Seattle, I instinctively revolted against the suffocating left-coast culture of the Soviet of Washington, and came to revere the four great Germans who helped inspire the Reagan revolution: Ludwig von Mises, F.A. Hayek, Leo Strauss, and Eric Voegelin."
However, he does link to real government sources (near the botton), so you can check to see if he weighs by ideology when posting numbers.
I applaud you for making an observation which could easily fuel an ad-hominem attack on an obvious partisan, and then holding back after observing that regardless of his biases, he is just tabulating official numbers.
When I see source and unknown reliability in the same post, my instinct is to check and make sure the person who said it knows where to find the tools to make that judgment on their own.
Sometimes they end up in disagreement with me, but I always prefer informed and still wrong to uninformed and wrong[1]. :)
[1]Which is not to say these numbers are wrong or right. I'm speaking generally.
However, he does link to real government sources (near the botton), so you can check to see if he weighs by ideology when posting numbers.