[xythian]

Most do not.

> As of June 30, 2019, a total of 21 states plus the District of Columbia have enacted same day registration (SDR), which allows any qualified resident of the state to go to register to vote and cast a ballot all in that day.

http://www.ncsl.org/research/elections-and-campaigns/same-da...

And, same day isn't necessarily the best solution. For example, Oregon does vote-by-mail. This process would make it difficult to allow for same day registration. But, Oregon also has nation leading voter turnout. No polling places, no hassle, just an envelope in the mail.

* Oregon also does automatic registrations when interacting with the DMV.

[Operyl]

Florida also does easy opt in voting (checkbox) with most DMV requests now too (not sure how long that’s been a thing).

[seanmcdirmid]

Isn’t that a federal law (the voter motor law)? See https://en.m.wikipedia.org/wiki/National_Voter_Registration_...

[Operyl]

Didn’t know that was a law, neat.