Biden gets points for being the first candidate to use the word “existential,” which now appears to be the favorite let’s-get-serious political word. Kudos.

Klobuchar, who starred in the last debate with her easygoing manner, was less, um, chipper. She tangled hotly with Buttigieg over who had the right experience to be president. “I wish everyone was as perfect as you, Pete,” Klobuchar said when Buttigieg attacked her for supporting a Donald Trump nominee in the Senate. “You have not been in the arena.”

“Maybe leading a diverse city that was facing ruin doesn’t sound like the arena to you,” he retorted. “You don’t have to be in Washington to matter.”

Woof.

Warren, who faded into the background in the last debate, made a comeback. She refused to let her ex-pal Sanders off the hook for the awful behavior of some of the “Bernie bros” rampaging on social media. (“We are all responsible for our supporters.”) When Bloomberg (“a billionaire who calls women fat broads and horse-faced lesbians”) listed all the female executives he’s appointed, Warren noted acidly that he was basically arguing everything he’s done was OK because “I’ve been nice to some women.”

Missing from the crowd was Tom Steyer, who’s now sort of the backup billionaire candidate. Steyer was knocked out of the debate by his bad showing in Iowa and New Hampshire, but he’s been campaigning like crazy in Nevada and South Carolina, telling the people his story in the most approachable way possible. “I started a business,” he says at the beginning of his speeches. It’s true, and definitely more populist than, “I made a ton of money as a hedge fund trader.”

As all the candidates in Las Vegas tried to throw in a little plug for donors to visit their websites, Bloomberg said, rather crankily, “Well, you can join me at mikebloomberg.com if you want, but I’m not asking for any money.”