If you post your location on twitter, they adjust your time accordingly. He was in Urbandale IA.
Sorry I wasn’t clear ... you had mentioned in your post that the caucuses didn’t begin until 8:00.
I was trying to point out that the caucuses began at 7:00 pm (CT) in Iowa, and that the Urbandale, IA post shows 7:07 pm (CT); so the caucuses had already begun.