What we are seeing, for the umpteenth time, is the Democrats' much higher degree of party discipline. They have exactly the same situation as did the Republicans in 2016: so many candidates that the field was hopelessly split, creating room for an unlikely insurgency. Had the Republican field acted rationally in 2016, it would have been a three, perhaps four, person race after South Carolina, and a two person race shortly thereafter. That would probably have produced Ted Cruz or Marco Rubio as the nominee. But Jeb Bush and, in the end, John Kasich ensured that would not happen, and that the non-Trump vote remained split. The Democrats aren't going to let that happen. They are going to clear the field for whoever has the best chance to stop Bernie. That now looks like Biden, a sad sack of a candidate, but at least not a raving communist.
Biden will be very dangerous in the general election. Yes, he's rapidly slipping mentally and he's corrupt. But the media will play coverup. The coverage will be a 24/7 hate on Donald Trump. Biden himself will be kept mostly under wraps. He will be handled with kid gloves and rolled out for the bare minimum of public appearances. The voters will not see Joe Biden in the flesh; they will see the Super Bowl ad version of Joe Biden. My guess is that there will not be a debate.
Trump lead the GOP primary wire to wire. Wiped the floor with Little Marco in his own state. Wouldn’t have mattered a bit if the other candidates had dropped out. Trump was always going to be the nom because the GOP base rejected GOPe on policy grounds and disliked their subservience to Obama.