Biden openly blackmailed Ukraine, saying they would not get a billion dollars in loan guarantee if they didn’t fire Ukrainian Prosecuter Shokin, who was investigating the $3,000,000 that Hunter Biden’s company got from Burisma. One month after that blackmail, Hunter got a $1,000,000 /year board position from Burisma. Sorry if Burisma didn’t just hand Biden a paper sack full of money to make the corruption more obvious.
The rest of your article is (IMHO) mostly spot on. Bernie beats Trump in something like 29 out of the last 30 polls, starting election night 2016. Bernie talks policies that will really help the average worker. Trump understands this. Trump knows he hasn’t delivered on his promises to help workers, and his 2021 budget is horrendous for the 99%. He is very right to fear Sanders.