We would be hard pressed to find such a person. None come to mind in in party in the US to me.
First off, you can't use anyone too adjacent to Biden. It's a losing strategy. This strategy has NEVER worked. Didn't work with Al Gore (Although he did win the popular vote let's not forget that). It barely worked with Biden, the only reason Biden won is because of the most extreme circumstances.
But yes the Democrats are a hopeless party. They have sold their souls to the military industrial complex, AIPAC, big pharma, wallstreet, and so on. It's so transparent that the only way they win is the Republicans do awful, which they will, and then the two party system defaults to its usual results.
Trump says things others will not. He is one of the few people running for President to actually call out the big lies America has been faced with (the war on Iraq, weapons of mass destruction, etc). This wins him trust to many people. It doesn't matter that he isn't an outsider, he appears to be an outsider more than most career politicians and that alone won him the election.