 Well, the 50,000 delegates, alternates, media, and guests who will be here for the Republican National Convention, Alex, have begun to arrive in town. Now, in advance of the event and in light of what happened today in Pennsylvania, security is being tightened. These are flatbed trailers hauling concrete barriers through downtown Milwaukee. As part of traffic control measures, they'll be set up in the coming day and a half or so before the convention actually starts.