It is illegal to hold public office if you have ever participated in a duel.

The Law

Enshrined in the Tennessee State Constitution is a clause stating that anyone who fights in a duel, or even acts as a 'second' to a dueler, is forever barred from holding any office of honor or profit. This 19th-century mandate was an attempt to curb the violent, aristocratic tradition of resolving political disputes with pistols at dawn.