Tiny Slices of History?

This morning, I dropped the husband off downtown at his internship, in a government office surrounded by other government offices. I've done this many times before. This was the first time, however, that traffic was stopped at Adams and Dearborn by a traffic cop who waved a squad car over to block the intersection... after which three more squad cars passed through, followed by at least half a dozen enormous black SUVs piloted by beefy guys in dark suits and sunglasses. Bringing up the rear was a Chicago Trolley, which I first found incongruous, but then concluded was perhaps ferrying the press. All told, it delayed me maybe a minute total... and I thought, I guess this is what it's going to be like in Chicago for the next few months. And I was pleased all over again.