Voter registration numbers alone are not predictive about the outcome of races: Democrats had a surge in voter registrations in 2018, and went on to win the House of Representatives but lost some races in key states where they had an overall registration edge. Democrats also led Republicans in voter registration in several key states in 2016 that they ended up losing. Party registrations are driven in some states by local and congressional races as much as the presidential race, too. And the difference of a point or two in voter registration only makes a difference in a close race. Analyzing voter registration — and how it might affect the outcome of the looming election — is also complicated by the fact that a number of states permit same-day voter registration.
Source: New York Times October 19, 2020 15:44 UTC