Chris, in case you missed it, I wanted to give you a round-up of last night's Democratic presidential debate. The big news of the night was the growing feud between Bernie Sanders and Elizabeth Warren.

Warren vs. Bernie

As you know, Warren says Sanders told her last year that a woman couldn't win the presidency. Sanders denies it, and repeated his denial last night -- which drew a sharp double-take from Warren. You can watch that moment here.

Warren did have a great response to the question about Sanders' comments, noting that a woman CAN in fact become president.

It appeared that both candidates had moved on, until moments after the debate ended, when Bernie reached his hand out to Warren, she appeared to refuse it, and the two then began to argue on stage in front of the cameras. You can watch that moment here.

Then, immediately after the debate, Sanders' team went on the attack, and suggested that Warren isn't a real progressive:

Next, the social media attacks began, with Sanders supporters calling Warren "a snake," while simultaneously sharing emojis of a snake on Twitter:

Buttigieg and Biden surprisingly unscathed

Buttigieg and Biden managed to avoid all of this. It was thought that the two men would receive the lion's share of the attacks last night, as they, Sanders and Warren jockey for first place in the upcoming Iowa caucuses. Instead, it was the Sanders-Warren feud that stole the show. Which only helps Biden and Buttigieg.

A word about Biden. He did okay, but it wasn't his strongest performance. He stumbled with his words a number of times, which reinforced the impression that he's getting up there, though he was solid on substance, particularly foreign policy. Klobuchar also did well, but it's not clear it's going to make a difference. For whatever reason, Klobuchar just can't break into the top 4. And, aside from their dispute, Warren and Sanders were, as always, solid on substance. But their spat definitely became 'the' story of the debate, and now threatens to eclipse any substantive points they may have made. And finally, there's Tom Steyer, who seemed outclassed by all the other candidates, who clearly have more policy chops than he.

Looking towards Iowa on February 3

In the end, it's not clear if anyone's performance is going to shake anything up -- most likely, partisans will rightly find something to laud in each of their favorites' performances. Remember, the top four candidates in Iowa -- Buttigieg, Biden, Sanders and Warren -- are all within the margin of error:

That's it for now. Hope you find this helpful. And thanks so much, JOHN

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