My understanding is this data is based on the Census Bureau asking people if they voted and if they were registered to vote. That would capture day of registration.
These data come from the 2020 Current Population Survey Voting and Registration Supplement for the November 2020 presidential election, which surveyed the civilian noninstitutionalized population in the United States.
My understanding is this data is based on the Census Bureau asking people if they voted and if they were registered to vote. That would capture day of registration.