Presidential debates are entertaining because they're forced to attack their own. Several of the candidates tried to get Elizabeth Warren to come clean on where the money is going to come from for her Medicare for All. They begged her to answer a simple "yes" or "no," on whether she'd raise taxes on the middle-class and she fumbled around a bit as usual when approached regarding the topic. As far as I know, she's never identified who she considers the middle-class are as far as an income bracket is concerned. A strategic move on her part? In no way has she clearly stated how she can legitimately pay for it.
Warren taxing the Top 1% was shot down by many economists. The bottom line is that there aren't enough rich people to pay for her program. When reports began coming out that her multi-trillion dollar program couldn't be paid for unless the middle-class were hit hard with tax increases, she's avoided responding to the research. It's both embarrassing and fun, to watch her squirm.
They laid off Bernie pretty much which was probably due to not wanting to get a blackeye for going after him so soon after his heart attack, but the fact is, he doesn't have a chance. Too many candidates have the same message and they're younger, and as the last several decades have taught us, age matters. Young people were fine with Bernie the first time around because he was the only one preaching components of socialism, now he's not.
I don't believe Biden said one thing that was new from a policy position. He's going to ride the Obama Administration out which at this point is probably the best route to take as pretty much every other candidate appears to have gone off the reservation. Not enough Americans believe our country needs to be transformed or that border walls are immoral and racists.
If Biden doesn't win their nomination, Trump, or President Pence if Trump gets impeached, will have absolutely no worries. If Biden does win, he provides the stability that wavering Democrats and some Independents will consider. I still believe Republicans will win in 2020 across the board, but it would be a much closer race if Biden got their nomination.