Where in the Constitution are either state governments (the people responsible for deciding how presidential electors are chosen) or Congress given the authority to interpret and apply the Constitution?
Article III directly gives the authority to the federal judiciary.
That means some state SOS is not allowed to decide what “natural born citizen” means, and without being able to decide that, how can they evaluate a candidate’s eligibility? Same thing holds true for Congress.
Article III is very short. I don't see where it directly gives the authority to "interpret and apply the Constitution" to the Courts.
Perhaps you'd be kind enough to point the wording out?
Let's assume you are correct. Do you seriously contend handing over more power to five lifetime tenure guys in black robes is a good idea?