These days a tour of the Whitehouse requires congressional clearance. According to the Web site: Requests must be submitted through one's Member of Congress and are accepted up to six months in advance.
I've walked around the Whitehouse. I've been waved at by, then, President Clinton as his motorcade pulled away from the rear gate (you could barely see the guy through the bullet-proof glass). I've chit-chatted with a uniformed Secret Service agent at a side entrance (those aren't hand warmers beneath those leather flaps). I've even stolen a few leaves off the lawn for Allie.
I still want to get inside someday.
This will have to do for now: