Advances in technology, meanwhile, allow campaigns to calibrate their outreach to only the most persuadable voters. The upshot is that a tiny segment of the population will get an outsize say in who leads the United States. And the will of the majority may not even prevail.


Isn’t that true in all closely fought races? They’re listing swing ridings that are likely to change.
Canada has been the same way for most of the federal elections since 2000 - there are a handful of ridings that can swing, and that decides which party wins.
Same problem, but states are a lot bigger (in terms of population) than ridings, and there are a lot fewer of them (50 vs 338)