Bernie. The party moved to him, which shows how influential he is. Nobody else in the party has been able to change public perception on things like medicare for all and minimum wage the way he has. And other frontrunner, Biden, preformed poorly, so that leaves him as the strongest frontrunner.

Honorable mention: Warren and Harris. By the next debate i would expect Bernie, Warren, and Harris to be considered the front runners.

2nd tier: mayor pete and gillibrand. I think both are running for VP more than president.

Lost the debate: castro and biden. Castro as being open borders makes him completely unelectable and Joe's being exposed.