A recent study (pdf) charted bureaucrats' alignment with President Bush and Congress from 2007 to 2008. John Sides summarizes their findings:
They … aggregate the survey responses to measure the average ideology of various federal agencies. And here’s where it gets really interesting. When agencies are ideologically far from the average member of Congress, the longer and more detailed are the laws that Congress passes to govern that agency. In other words, when an agency is ideologically distant from Congress, Congress appears to afford that agency less discretion, as manifest in its insistence on these detailed legal rules.
The Dish 