How do you determine whether the vote is close? Use a threshold like 66%? What if the vote is very close to 66%, and it's not entirely clear whether it's abov

How do you determine whether the vote is close? Use a threshold like 66%? What if the vote is very close to 66%, and it's not entirely clear whether it's above or below? It's exactly the same problem as determining whether a candidate has gotten more than 50%, only shifted around.