@revelette3,
I initially thought Warren would do better than Sanders. I like her technical mastery of economics, see it as a big asset re. Sanders. And she did do better than him at start. A number of factors helped him get back in the race: AOC's endorsement, the TV debates, Warren's perceived evasiveness on how to pay for her health plans, etc.
It may well be that there was an element of
fashion in her candidacy, as the selfie thing would tend to indicate. Fashions come and go. She ain't finished yet. It'll be a long race, but the sooner the "progressives" coallesce around one candidate, the better for them. Biden is still in a comfortable lead.