Who would theoretically vote the Democratic Party from Andrew Jackson to Joe Biden?

[MarkD]

I don't understand this question. Are you asking about a "theoretical" guy who was born in, at the latest, the year 1811; the first presidential election he could have voted was in 1832; he voted for Andrew Jackson on that occasion, and for the next 188 years he kept on voting Democrat in every presidential election? A "theoretical" man who voted for Joe Biden when he was at least 209 years old, and that vote for Biden was his 48th consecutive vote for the Democratic nominee? That's what you mean by "theoretical"?

Okay, I'll bite. I think that man was told, when he was a teenager, that the Democratic Party will always "stand for the people" - he was told that the word "Democrat" was derived from demos, which means "the people" - and for the rest of his life he never found any reason to disbelieve it (because he didn't try particularly hard to look for any evidence that contradicted it).

Now, in the same vein as your question, here's a "theoretical" question of my own: If a (roughly) one-year-old baby voted in 2004 for John Kerry, would that child continue voting Democrat for the next four elections (Obama twice, Clinton, and Biden)?

Theoretically?