I'm beginning to like Warren, as well; she is probably the most qualified candidate. At one time, I thought the American Indian thing was a knockout blow, but the story has grown stale. Trump referring to her as "Pocahontas" 10 times a day would backfire on him at this point. I thought that Reagan was a lesson learned about someone being too old and Warren turns 70 next week, but Biden, Sanders and Trump are even older. Ridiculous.
Biden was terrible candidate in 2008 and dropped out after receiving 1% of the vote in Iowa. I don't see why he is suddenly a great candidate as he nears 80. Though he won't say as many dumb things as Trump, he doesn't have Trump's magic force field. He also has decades of videos and quotes for the Republicans to comb through.
The early polls are meaningless and I believe that Klobuchar will move up quickly once the debates start. I followed the Republican campaigns because of Trump, and Bush, the early front-runner, cratered early and I don't think Trump's clever nickname had anything to do with it; people just didn't like him. The moran Carson even led for awhile and Fiona was gaining traction at one point.
Buttigieg's education is as good as it gets and his military experience adds to that. However, a 37-year old mayor of a city with a population of 100,000 has no chance. A better strategy for him would be to wait 10 years, or so, and become a senator or a governor in the interim. I thought Rubio had the potential to become President someday, but he wasn't ready in 2016 and I believe he ruined any chance of winning in the future.
People talk "teams" of President/VP picks but the the VP will have no effect on the election. There is a theory that VP picks can deliver home states, but that is not supported by the data. Most of the candidates for VP are from blue states and if the pick was Harris, for example, California was delivered decades ago.
https://www.politico.com/magazine/story/2016/04/election-2016-vice-president-selection-matters-less-than-you-think-213805