Since the date of election is set BY CONGRESS as the Tuesday after the first Monday in November the year prior to the end of the term, how about suggesting to your state legislature to change the date to, say, January 2 of the year that the term expires? How about January 6 of the year that the term starts? Using your logic, both dates would be Constitutional.
How about moving international relations to cities? How about moving complete control of national defense to the individual states? How about letting each state impose its own set of tariffs? Why have a nation at all?
Where the Constitution is silent, the feds should also be silent.
International relations, defense, and tariffs? Issues covered by the Constitution. Mysteriously enough, primaries are not. The Article reads specifically
"The times, places and manner of holding elections for Senators and Representatives"
I agree Congress should be in charge of the election, however there is no mention of how the candidates are chosen. Therefore, a state issue