[RyZ]

I think the most interesting candidates, by a long shot are Andrew Yang and Tulsi Gabbard. They are "new leaf" candidates that will get a lot of moderates and undecideds to take a look at the Democrats. I think both of these 2 are the biggest threats to Trump in a general election. I'm a right leaning moderate (mainly economics), but would take a serious look at either of these 2.

Bernie is divisive inside his own party by virtue of simply being straight, wealthy, white and male. He'll be in a #NeverTrump situation where large sections of his own party will never support him. He will create huge turmoil within the Democrat party that wont be a positive during a campaign.

Harris and Booker are the types that Trump hopes wins the Dem nom and runs against him. He would rather go up against an identity politics fueled, negative "if you dont vote for me you are a Nazi/white supremacist/anti woman/homophobe/etc" type of opponent than anyone else, which these 2 strike me as being this type. Especially Booker. Trump has the best chance of beating a candidate/campaign like that and retaining power.

I think Warren/Biden would get steam rolled.

At the end of the day though, I think the campaign messaging is going to be more important than the candidate.