Gadol, I agree with your prediction. From the a different angle: If Hashem wanted Biden or Hillary or Trump to win, he could arrange a landslide. Maybe Hashem simply wants us to have competitive elections?
Why? Beyond the obvious effect on society, maybe he wants us to review our assumptions about society; to care about the whole country (like davening in the minyan v by yourself); learn to speak respectfully and truthfully instead of simply repeating propaganda; and above – to be humble as we can’t predict an outcome of an event in 2 weeks after probably 100K people were already asked and 95% of them are not changing their opinion ever.