What's the big deal? Lots of people that work for Israel and the US live in Washington DC. That "ISIS member" was probably hoping that the president would cut him a check directly. But most likely someone was just doing some propaganda public relations work for the ISIS. Look how scary! A person with a smart phone in front of the White House having a picture taking by another smart phone. Wouldn't it be weird if it was just a Jєω trolling dumb Americans (and it worked again).
Anyway, as it has already be pointed out the ISIS is a Western and Israel Intelligence creation. That's why they have been so successful. That's why they are trying to be scary to dumb Americans.
I have say I think that this kind PR is laughable, not scary at all, but if the ISIS did blow up the White House. I wouldn't be unhappy about it. Lots of Americas wouldn't.
So go ahead "ISIS member" and do your best in Washington D.C. I'll be waiting by the TV for all the Washington Senators, Congressmen, and President and his cabinet all being taken out by a mysterious and scary Muslim with two smart phones (How can he afford two? Uncle Sam must pay well).