Adam, the "rule" was made up on the spot.http://www.dailykos.com/story/2011/08/24/1010315/-Rep-Steve-Chabot-has-Police-Confiscate-Video-Cameras-Cell-Phones-from-Constituents-at-Town-Hall
"A Chabot spokesman said they had the cameras seized “to protect the privacy of constituents” at the event, although there were at least two media outlets at the North Avondale Recreation Center filming the meeting."
"While the Ohio open records law does not specifically state whether you can use recording devices at a public meeting (i.e., a meeting of a governmental body required to be open to the public by law), the Ohio Attorney General has an issued an opinion stating that using them is permissible when it does not unduly interfere with the meeting. As a matter of practice, recording devices apparently are common in Ohio public meetings."
If anything, the seizure of the cameras interfered more with the public meeting than the attempted amateur filming of the Congressman.