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This was touched upon heavily in the book 'The Righteous Mind' by Jonathan Haidt, an amazing book if you're interested in this sort of thing and part of Bill Gate's reading list where I first found it. This quote (by Bertrand Russell) stood out: "Social cohesion is a necessity, and mankind has never yet succeeded in enforcing cohesion by merely rational arguments. Every community is exposed to two opposite dangers: ossification through too much discipline and reverence for tradition, on the one hand; and on the other hand, dissolution, or subjection to foreign conquest, through the growth of individualism and personal experience that makes cooperation impossible." |
An entire generation grew up in that atmosphere... they became the nation's teachers and leaders, influencing the opinions of subsequent generations. Game theory shows small changes in behaviors and opinions can have massive downstream impact, as demonstrated by this interactive demo: http://ncase.me/trust/ (HN post: https://news.ycombinator.com/item?id=14864183).
I haven't had any luck finding studies or data on this topic. The key would be voter turn-out for each party bucketed by age for the past few decades of elections.
If my propaganda theory holds true, the Republicans would see a popularity boost that ages at roughly 1 year per year. That segment would be ~50-80 around now, which does match recent voting data (older voters consistently skew conservative) - but historical data is needed to track a bulge over time and disprove the "naive youngsters vote liberal" narrative.