There is no national popular vote as such.
We have 50 state elections, plus an election in the District of Columbia, to choose electors to the electoral college.
I need to brush up on the constitution, but, I think elections are always conducted by the states, within the states, with the federal government having very limited roles in how elections are conducted.
The 12th amendment indicates that states choose their electors to the electoral college. They aren’t even required to choose electors by popular vote. Every state does use the popular vote, but are not required to.
This plan is sunk if any state decided not to have a popular vote for presidential electors. Then you would be comparing apples to oranges to try to determine the national popular vote winner.
Not only is there no national popular vote, as such, there is also no trusted enumerator.
What are these states going to do to determine the “winner”? Check with PBS?