Its a simple truth that people seem to always forget. Women outnumber men and for the foreseeable future always will. Women also trend more liberal/left the longer they live.
Women are 53-56% of the electorate (Dem and GOP) so if we operate from a frame that says men vote basically 50-50 then women are the key. Hilary didn't win because people stayed home and more white women voted for Trump.
Fast forward to 2022, and you'll see that White Women ALONE whooped the GOPs ass in battle ground states. They held the Senate and completely flipped certain states like Michigan. And that's in a MIDTERM. Literally if you lose most women you WILL LOSE the election.
THEY are the swing vote. Minorities are already for the most part accounted for.