That's a side effect of the way we've suborned the electoral college. When an individual in the U.S. "votes for a Presidential candidate", they are actually voting in a state-wide election (to determine who the state's electors vote for). The election isn't national, so there's usually no need for the Federal government to be involved.

That's also one reason we're so hesitant to get rid of the thing: at the same time, we'd need to nationalize election administration. If we didn't, it would be much easier for states to "cheat" and exaggerate their voting power by claiming higher voter turnout than what actually happened.

Think of it like a badly-designed old dataflow that you would love fix, but there are so many dependencies now that it's become a major project.