One thing I think you can say that polls have been extremely *weird* lately. In early/mid September, the polls were pretty "well behaved" and consistent with one another. Now everything is like super good for Democrats or super good for R's with little in between.
In tumultuous news cycles, there are potentially more issues related to response bias (i.e. certain types of voters become more likely to respond to polls). That's a tricky thing to combat, so pollster methodology can be make more of a difference than in calmer news cycles.
Overall, though, it's definitely a good time to rely on averages rather than building narratives from individual polls. I think there *is* enough evidence to say Dems' position has worsened in the Senate, which may or may not be Kavanaugh-related. Otherwise, it's *very* unclear.
