If you want to see Copperheads, just check out CNN.
I believe the attribution of where the term Copperhead comes from is incorrect. From my reading it has to do with the fact that the Peace DemoRats of the time wore Copper pennies on their lapels as a signal of their point of view -thus the term Copperheads. I can't see how a peacenik could be perceived as dangerous - except perhaps to the safety of the Union itself!