> Are there some other measurements based on something else
For 2016 and 2018, Pew had validated voter datasets, based on people in their American Trends Panel who were matched against voter databases and thus known to have voted. Assuming they do the same thing (or some other reputable firm does something similar, or ideally both) for 2020, that would probably be the best data source.
For 2016 and 2018, Pew had validated voter datasets, based on people in their American Trends Panel who were matched against voter databases and thus known to have voted. Assuming they do the same thing (or some other reputable firm does something similar, or ideally both) for 2020, that would probably be the best data source.