This is known as the "Winner take-all effect". The electoral college also has a small-state bias (smaller states get more electoral votes per person than large

This is known as the "Winner take-all effect". The electoral college also has a small-state bias (smaller states get more electoral votes per person than larger ones). Historically, these two have often approximately cancelled eachother out as they favored opposite parties. But there's no guarantee of that - when Reagan won with 58.8% of the popular vote, he took 97.5% of the electoral vote. Similarly, sometimes the small state bias is a substantially stronger effect: when Trump won with 56% of the electoral vote, he had only 46% of the popular vote, largely due to Clinton's higher "wasted" margin of victory in larger winner-take-all states.