According to https://projects.fivethirtyeight.com/democratic-debate-poll/
Elizabeth Warren was the runaway success story gaining substantially in the polls while the others mostly saw small rises, with Beto being the sole loser. Castro was a distant second. Here are the gains/losses on the polls after the debate:
1. Elizabeth Warren +5.9%
2. Julian Castro +1.8%
3. Tim Ryan +1%
4. Cory Booker +0.9%
5. Amy Klobuchar +0.5%
6. Bill De Blasio +0.3%
7. Jay Inslee +0.2%
8. John Delaney +0.2%
9. Tulsi Gabbard +0.1%
10. Beto O'Rourke -1%
Another Metric was favourable/unfavourable - it seems many are still undecided on a number of candidates.
All candidates saw improvements in favourability and unfavourability.
Only Elizabeth Warren avoided any significant increase in unfavourability - which is interesting considering she was on the extreme left of the candidates in the debate. The largest increases in the unfavourable vote went to Tulsi Gabbard, Tim Ryan, John Delaney, and Beto O'Rourke.
Julian Castro saw a massive increase in favourability, while Beto is the only one that saw only an insignificant increase.
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