(This is the 22nd edition of our power rankings of Democrats most likely to get their party's presidential nomination in 2020.)

(CNN) Within the first 10 minutes of Tuesday's fourth presidential debate, you could tell something fundamental had changed in the race: Elizabeth Warren is the new front-runner.

The Massachusetts senator was attacked from all sides from the get-go -- on how she planned to fund her "Medicare for All" plan, on the "punitive" nature of her policy solutions, and on her supposed claims to be the only one in the field who had bold ideas.

By our count, at least seven other candidates on the stage attacked Warren at some point during the three-hour debate. That dynamic ensured that the fourth debate wouldn't be as successful for Warren as the previous three -- no one can take that amount of incoming and emerge unscathed -- but also proved, very clearly, that no matter what the polls show, her rivals believe her to be the one to beat in this race.

We've reflected that changed reality in our latest 2020 rankings. Below, the 10 men and women with the best chance of emerging as the Democratic nominee in 2020.

10. Tom Steyer: If you saw an unfamiliar man on Tuesday's debate stage, you probably were looking at Steyer. The businessman managed to qualify for the debate by : If you saw an unfamiliar man on Tuesday's debate stage, you probably were looking at Steyer. The businessman managed to qualify for the debate by buying a lot of ads in the early primary states to boost his poll numbers. It won't be the last time Steyer appears on stage, as he has already qualified for November's debate . That puts him in a better position than a majority of Democrats running. (Previous ranking: 10)