Is it possible that if a state has pre-registration for 16/17 year olds and also party registration, that you can use that data to get a peak at the partisan lean of the high school demographic
(half of it anyway)? I noticed this article about California's, and only 9.5% of pre-registered 16 & 17 year olds is particularly striking. It's actually not that far off from Trump's vote share among 18-24 year olds - a mere 18%. If you combine NPPs who would probably vote Republican too, it makes more sense. I'd be curious how partisan pre-reg data looks for other states.
https://www.mercurynews.com/2018/10/27/californias-teen-voter-pre-registration-builds-momentum-heading-into-midterm-election/I also like the idea that this increases turnout too. That definitely does make sense. Registering to vote probably isn't a big priority of any 18 year old, but pre-registering them when they get a student driver's license or interact in some other way with state agencies is a good way to remove a hurdle that is very relevant to of-age voters. Particularly for teenagers who turn 18 right before an election and either have no time to register due to stupid arbitrary deadlines or who become eligible just week(s) before the deadline.
