My diagnosis of Joe Biden’s sudden lurch to the far left is that Joe pretty much never believed in much at all. He said what he said and did what he did to secure his grip on power. For most of his career, that meant representing himself as a moderate, good old likeable “lunch pail” Joe. Thus, when President Obama needed an alleged moderate grinning white male vice president to reassure the voters about himself, Biden was more than willing to be the useful prop. However, when, as a consequence of the Democrat determination to get rid of their mortal threat, Donald Trump, “by any means necessary,” power brokers in the Democrat party offered Biden a deal — that they would grant his lifelong dream and install him in the presidency by representing him as good old moderate Joe but only on condition that he agree to implement their entire far-left agenda if elected. Biden did not hesitate to agree. He did not think about the country. He thought about his favourite subject matter: Himself. Similarly, when he thought about choosing a running mate, he did not think about the country. He thought about himself and picked a VP candidate based, not on actual ability but upon his agreements with the far-left power-brokers of his Party.
Good summary.