First, I agree with radicalwin that Trump desperately needs Nevada. OK, I also agree with Monet that a 269-269 tie would make for unbelievable television.
One scenario, that I thought could occur is that the election goes vanilla and we come down to the last four states )all 2016 red) that Biden had the best opportunity to capture (Wi, MI, PA, AZ). Technically, these were the four most probable states that Biden could flop to his side. Last night I stated that if Biden gets WI, MI, and AZ he would be one electoral vote short This is a strong scenario, with PA to be determined.
How can a candidate get one extra vote? All states have a three electoral minimum. The secret is with Maine and Nebraska. They are the only states that divide their electoral votes based on districts. In 2016, Clinton won three of four in Maine and Trump won all five in Nebraska. Trump was safe with his one vote in Maine, but the 2nd district in Nebraska was won by 2.2%.Most individuals would not care about one vote out of 538.
I believe that Trump's advisors saw the same potential of a one vote swing making a difference. Why do I say that? Seven days ago Trump held a rally in Omaha in ten degree weather. He did not go anywhere else in this five vote state. Yes, Omaha is the largest city. Being a city, means more potential Democrats. Trump's team attacked WI, MI, and PA last election in a great strategy. (at late stages). Going after this one vote was also prudent.
To me, Omaha may be the a district that can be recognized in the annals of history for a few reasons. One, if Biden claims NV, WI, and MI he has 270 votes. Without Omaha, he sits at 269 which makes PA more volatile than ever. Lawsuits would be all over the landscape.
Why? Because of PA allowing mail in ballots to have an Election Day postmark but be received within three days after the election. This was state approved. If Biden gets to 270 before PA is determined, then this argument is moot. This is the one things that Trump is focusing on. Are there other things that Trump can contest? Yes. But WI, MI, and NV have mail in ballot deadlines of 7 or 8 PM on Election Day. Just like most of our states.
Hence, Omaha is an enormous single electoral vote in numerous ways.