Thanks to a recent thread in a newsgroup forum, I found this very useful link about State Laws and Guidelines for photography or videography of voters, voting, and polling places. Please note the disclaimer on the web site saying that the information is not meant to be interpreted as legal advice. If you are interested in taking a camera with you to vote, you should do your own advance legwork so you know what the rules or laws are, and if you need special permission(s).
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Copyright info for using or linking to the pictures.