A rally for Presidential candidate Barrack Obama that was held under a First Amendment permit on park grounds on the afternoon of October 18th drew an estimated crowd of 100,000 people â the largest rally for the candidate held to date in the United States. At one point, lines of people to be screened at magnetometer locations were estimated to be nearly two miles long. Southeast Regionâs special events team, supported by rangers from Ozark NSR, Lincoln Home NHS, Hot Springs NP, Buffalo NR and Midwest Regional Office, supplemented park staff in providing security for the event. The Arch itself, along with the underground museum complex and the Old Court House, remained open to visitors throughout the event. While numerous illnesses and injuries were attended to by city EMS crews, only two additional First Amendment events were held, with no arrests or other major law enforcement problems arising.