Senator James Shields represented Illinois, Minnesota, and Missouri in Congress at different points in his career, the only person to represent three different states.
He also once challenged Abraham Lincoln to a duel, which was called off at the very last moment.
If this is the duel I'm thinking of, it was called off because Lincoln wanted to fight with, and I quote, 'cavalry broadswords of the largest size', in what would now be considered essentially a mud-wrestling pit with a board over it, and Shields realized how out of hand the situation had become and backed off.
