If fences won't work, why does the White House have a fence?

Bush says we shouldn't build a fence to protect the U.S. from invasion because it wouldn't work. Well, then why is there a fence to protect the White House? If fences are useless, why not take the ones enclosing the White House down, they must be a failure too. Oh wait, the reason Bush doesn't want a fence protecting us is because it would work, and if there was one, the American people would see that it does work, and he cannot possibly have the public see that we can be protected from invasion by Mexico, or else his plan to have us merged with this third world sh#&hole won't go through.

Yeah fences won't work if they aren't there! BUT guess what? They will be built and they will work!