The current state-by-state winner-take-all system of awarding electoral votes maximizes the incentive and opportunity for fraud, coercion, intimidation, confusion, and voter suppression. A very few people can change the national outcome by adding, changing, or suppressing a small number of votes in one closely divided battleground state. With the current system all of a state’s electoral votes are awarded to the candidate who receives a bare plurality of the votes in each state. The sheer magnitude of the national popular vote number, compared to individual state vote totals, is much more robust against manipulation.
National Popular Vote would limit the benefits to be gained by fraud or voter suppression. One suppressed vote would be one less vote. One fraudulent vote would only win one vote in the return. In the current electoral system, one fraudulent vote could mean 55 electoral votes, or just enough electoral votes to win the presidency without having the most popular votes in the country.