It's not just the choice of candidates that is contentious this presidential election in Tennessee. Voting itself, and who gets to do it, has become such a hot issue that federal election monitors are in Memphis and Nashville watching the polls.
On the one side of the controversy, people concerned about voter fraud want more protections to ensure that only those qualified to vote cast ballots. That concern led to the state's new voter photo identification law and may have been behind a poll worker training in Nashville that taught workers how to challenge a voter's citizenship.
On the other side are those who see the photo ID law and similar measures as a pretext designed to keep the poor and those with limited resources from exercising their legitimate vote.