Snopes confirms that the location is accurate, and it's a legit recording, but it's not possible to confirm the exact date of the video.....could have been any day when serious vehicles were heading for the gov't building.
Meanwhile, coming soon to a Post Office near you:
There's also a stamp honoring Ursula K. LeGuin due out this summer. Now she does deserve that honor, but one would have thought that the first American SF writer to be honored with a stamp would have been someone like Robert Heinlein, Isaac Asimov, Ray Bradbury, or John Campbell.....