Another stray thought: Polls in Nebraska were pretty accurate. On average slightly overestimated Democrats. But the NYT/Siena numbers were a little hot for Republicans.
Contrast with polls elsewhere, which missed low on Dems.
1. The GOP nominee in NE-2 was going to be toast no matter what. Just no chance you could withstand that kind of national landslide in a Harris district.
2. "Dark Money Denise" did not work for John Cavanaugh in the primary or for Harding.