YouGov polled Senate races four times for CBS News and the New York Times over the course of the campaign with interviewing in the final wave between October 16 and 23. In addition, we conducted separate polls, independent of the CBS/New York Times Battleground Tracker, in the week before the election (October 25-31). …
In terms of getting the outcome right, we did fairly well (only missing in Iowa and North Carolina, where we gave Democrats leads of 1.0% and 2.1%, respectively). However, from the scatterplot in Figure 1, it is evident that we had a consistent overstatement of the Democratic vote. CONT.
Doug Rivers, YouGov