Thanks for that link. The favorability got updated in the meanwhile:
Biden gained minimally, both in favorability and unfavorability, leaving him virtually unchanged.
Sanders, on the other hand, gained a bit of favorability, but his unfavorability dropped also bit, making him come dangerously close to Biden
Warren gained a nice chunk of favorability, just enough to overtake Sanders in the process in that regard, all while being the candidate apart from Buttigieg with the lowest unfavorability, giving her the best ratio by a long shot.
Harris gained twice as much unfavorability as she gained favorability, overtaking Sanders in that regard. But she didn't botch up as much as Beto did, who not only gained over 5% in unfavorability, but also is the only candidate who lost favorability. Gabbard gained more unfavorability than him, but also gained some favorability, hence making Beto and Tulsi the big losers of the evening. Castro is o the third spot with these dishonors, as his unfavorability rose quite a bit while his favorability stayed almost unchanged.
Cory Booker is also one of the losers. He gained more unfavorability than he got favors. However, this should help him overtake O'Rourke.
Finally, Klobuchar and Buttigieg stood out, and it shows: Klobuchar won 5% of favorability, while Buttigieg won almost 4%. Those two were the winning duo of the evening, trio if we add Warren, who showed she doesn't falter under a slew of attacks (imperative if going against Trump), which is probably why she rose as well as she did.