A "tight race in 3 battleground states" does not an electoral college win make in this election. Why? Because as one can see from the 2000 election's results, the Democratic candidate can win with just one swing state whereas the GOP nominee needs several to win. That the race is tight in those three states is about nothing other than the fact that both major party candidates have high unfavorables; thus many voters apparently view the race as one of choosing the "best of the worst."
Ohio and Nevada seem routinely to be swing states insofar as they align with whomever actually wins the election. NC should be "in the bag" for Trump -- Obama won it only once -- yet it is not. That seems to indicate that Trump is viewed as being the "worst of the worst."