Of course, it is too late for Tom Tancredo's presidential ambitions. And yes, he's a loon. But still, this advertisement he aired in Iowa repays watching. This sort of thing is terribly unpopular - and vulgar - in Washington, but there are plenty of people who will agree with the guts of what Tancredo has to say here. And not all of them are Republicans. [Thanks to Garance for the spot].