Ben’s Guide to U.S. Government for Kids

From site: 

This site provides learning tools for K-12 students, parents, and teachers. These resources  teach how our government works, the use of the primary source materials of GPO Access, and how one can use GPO Access to carry out their civic responsibilities. And, just as GPO Access provides locator services to U.S. Government sites, Ben’s Guide provides a similar service to U.S. Government Web sites developed for kids.