1. I believe the hard core democrats want Biden out of the way and will try to eliminate him as they did Bernie in 2016. Agree or not?
Not sure of your definition of "hard core", but I do think the more progressive Dems don't want Biden. Biden is sort of like comfort food for a lot of Dems, but too tame and not exciting enough for others. I'm totally undecided myself, I do like Mayor Pete, but not sure he is electable, he's not connected with African Americans and Latinos. I'm not in favor of Medicare for all without the option of keeping employer funded insurance as an option, I'm definitely in favor of a public option.
2.) Bloomberg has officially entered the race. Which democrat is most affected by this and can he beat Trump, IF, he by any chance wins the nomination?
I think the candidates least effected are those that won't be around much longer. Just my opinion, but I don't think Bloomberg has much of a chance outside of the fact that he can easily outspend anyone. He has some baggage, sexual harassment stuff at his company, he's criticized the "me too" movement and he's been termed a reluctant Democrat. Having said all that, I think the Dem front runners will all be concerned, but it's really too early to tell if he'll have much of an impact.