But that isn't what this measured. Like how the US census is suppose to be an exact count of everyone on April 1; it may change due to births and deaths, but on

But that isn't what this measured. Like how the US census is suppose to be an exact count of everyone on April 1; it may change due to births and deaths, but on that day (at some time) it is suppose to be exact. A vote is an exact count of the will of the people at a given time. There is no error. People can change their minds, but that isn't what the vote represent. That is, a vote is what people who chose to vote said they wanted, not a probabilist representation of what the people as a whole want.