There are, of course, reasonable limits to your rights. However, I don't think this case is one. And it's pretty obvious to me that the real reason is *not* security. It is to restrict unwanted speech. If someone did want to cause harm at one of these things, they would be stupid to draw attention to themselves by waving a sign around.
On the other hand, the DNC should be allowed to have some reasonable methods in place to make sure, for instance, that delegates and attendees can enter and exit safely and efficiently. If this scheme is anything like the other recent ones, the 'protesters' will be kept well out of sight of the actual convention.
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