A cross from the White House sits a museum called The People’s House: A White House Experience. Inside is a replica of the Oval Office, and interactive exhibits on what it’s like to attend a State Dinner or sit in on a Cabinet meeting. It’s about as close to the White House as you can get without actually being there, a wholesome reminder of how democracy is supposed to work. But early last Saturday evening, two bullets shattered the glass between displays of Christmas ornaments and dining