I like Biden because he's a follower, unoriginal and so dependent. But his most powerful trait is he can fool so many people with a disposition like a used car salesman. One moment he's their best buddy, the next comes buyer's remorse. Try doing that successfully for 50 years, Biden's nailed it. Takes a special character to accomplish that. Harris carries the same traits thankfully, though with one major distinction, which is she'll never master it. Unfortunately she just isn't likeable, and she can't fool many to think otherwise. She's establishment friendly but she's untalented.
Obama was the most talented of the bunch though, a God-send for global interests & control. He's a very talented con-man, I think most people miss it. He strikes me as two molecules & one head injury away from genius. He aces narcissism, just to wake-up in the morning he's already better & more understood than you.