Evidence is beginning to trickle out that the female W.H. staffer who arranges such things is a personal friend of the gatecrashers, and apparently while out front greeting the invited guests told the Secret Service to let her buddies in, as she could vouch for them. This happens occasionally, when the ones being vouched for are to be given a special tour, not available to the general public, of various restricted places like the Oval Office, so the Sec. Serv. people were accustomed to it, but were not told that the couple would have physical access to the president, VP etc. or they would certainly have vetoed their entry. The one worrying aspect is that the couple seems to have had contact with Islamic groups, although whether the groups are radical or not is unclear.
The Administration, of course, is attempting to whitewash said lady, and blame it all on the Sec. Serv. Reminds one of Hillary Clinton insulting them, brave men who were just trying to do their duty to protect her sorry ass, even using the F Word to them, and in one instance throwing a book at one. She even forbade them to salute in the W.H., and subjected the Sec. Serv. agents who were willing to take a bullet meant for her or Bill, to insulting behavior.
From Hell to Pay; The Unfolding Story of Hillary Rodham Clinton By Barbara Olson [who died in one of the 9/11 airliners to hit the WTC]:
"The agents felt mistreated by a first lady who openly regarded them as servants, making them carry luggage, a humiliation for law enforcement officers and a distraction for agents who needed to keep their eyes on the crowds and their hands free to act."