I don't disagree with you on the argument of how charisma plays into elections, but you're letting your preference for conservatives skew your evaluation of Democratic primary candidates. Gabbard got a national profile because of her proximity to Bernie's 2016 campaign, but now is not liked among Democrats and widely seen as an opportunist seeking better fortunes among conservatives. She got 0.7% in the 2020 Democratic primary not because she is a Strong Charismatic Leader, but because voters didn't care for what she was selling or how she was selling it.
At any rate, charisma isn't a partisan attribute. It really doesn't have anything to do with political positions. Trump has a certain kind of charisma himself even if he is a mean-spirited bully. Obama, Clinton and Reagan all had it too. Biden and Harris don't (imo). Gabbard has even less charisma than them. If charisma was all it took to win an election, Trump should have beat Biden.
Buttigieg does not have charisma either.
