For all the folks who like to pick their poison, early voting is under way in Tennessee.How we arrived at these final presidential candidates should be a social experiment that’s studied for centuries. There has to be a giant camera trained on America with someone waiting behind a velvet curtain ready to say, “Surprise, you’re on Candid Camera.”As we watch our presidential election degenerate before our very eyes, one thing is clear. We’re going to wish for the days of President Barack Obama when he’s gone.Just look at this U.S. snapshot.