Would these people be intimidated if they were waiting in line for a big sale at a department store? Are we intimidated when we go shopping, eat out, or even drive our cars? Right or wrong cameras are everywhere. No one sees who you vote for. If someone feels intimidated at a poll then my question if why? Are they voting twice? An illegal? Felon?
There are laws which prohibit anyone who is not voting from being within 50-100 feet of a polling place. It is also against the law to impede voters. If he was truly "in their faces" the law would apply. It would also be illegal to film people in line at Walmart, etc. without the store's permission, as even the parking lot is private property.
There is a great quote from photographer Diane Arbus who did a lot of portraiture and street photography (like Weegee did before her).
It is along the lines: "Having your picture taken is the risk you face for going out in public."