There’s more than two choices the same way there’s more than two choices for calling a coin. You can call a side. You can call for the edges. You can call that it balances diagonally. You can even call for a unicorn to magically appear over one of the sides. The chances are so slim that you might as well have chosen no side at all, but it could happen, and it is a choice.

Personally, anyone that says there are more than two parties has no idea how statistics and/or voting works, or they don’t really care about the outcome.