About 15 miles from Capitol Hill, in an unassuming, unincorporated part of Maryland's Prince George's County called Cheltenham, deep in a tree-lined residential area, past a sign that reads, "Federal Law Enforcement Training Center, Homeland Security," my ride drops me off by a security booth. Then I'm driven down a winding road, through a large open campus dotted with distant structures, to a brownish brick building that looks like a public elementary school. Inside it are life-size reproductions of key parts of the U.S. Capitol.This past March, at a House Appropriations Homeland Security...…About 15 miles from Capitol Hill, in an unassuming, unincorporated part of Maryland's Prince George's County called Cheltenham, deep in a tree-lined residential area, past a sign that reads, "Federal Law Enforcement Training Center, Homeland Security," my ride drops me off by a security booth. Then I'm driven down a winding road, through a large open campus dotted with distant structures, to a brownish brick building that looks like a public elementary school. Inside it are life-size reproductions of key parts of the U.S. Capitol.This past March, at a House Appropriations Homeland Security...WW…