All campaign long, Democratic candidates have fought hard to get on the debate stage.
Maybe Mike Bloomberg should have fought to stay off it.
Because instead of taking center (and centrist) stage, Bloomberg was upstaged by Elizabeth Warren's withering attacks on another "arrogant billionaire" in the race.
Despite decades in the public eye, including in the fishbowl of Gotham politics, New York's former mayor seemed unsteady and unready to respond to what had to have been a well-telegraphed attack.
Which just goes to show that while Bloomberg's billions can buy countless campaign commercials, in influential debates like the one Wednesday in Las Vegas, it's not ads, but ad-libbing that matters most.
Indeed, in a matchup that set all-time ratings records for a Democratic debate, Bloomberg didn't deftly deflect the attacks. So the mayor may have missed his chance to coalesce the centrist vote that's been bigger than the Elizabeth Warren-Bernie Sanders sum in Iowa and New Hampshire.
Instead, with most of the focus on Bloomberg, the night was a win for the relatively unscathed Sanders (let alone President Donald Trump, who was often left alone amid all the intraparty infighting).
Sure, the other mayor on stage, Pete Buttigieg, pressed Sanders on online aggression from the so-called Bernie bros. Others questioned what they seem to see as Bernie bromides on health care, college costs, student debt, the Green New Deal and other expenditures that cost Warren support once she priced them out.