Second district candidate Kara Eastman was way too radical and socialistic compared to retired Air Force brigadier general Don Bacon. Bacon even got the endorsement of Democrat Brad Ashford, whom Bacon unseated in the previous election.
Douglas County went reliably for Eastman, but the part of Sarpy County that’s in the 2nd District ensured a Bacon win. That has nearly always been the case. Not sure how that transmutated to the election for POTUS.
Douglas and Sarpy Counties run clean elections, as does the rest of Nebraska.
Much NeverTrump sentiment?
As you can see from the tables, Trump got 11,000 more votes in Douglas and 4,000 more votes in Sarpy in 2020 than he did in 2016, when he was a suspicious quantity in the minds of many rock-ribbed Republicans.