There is doubtless some of that as well. If you go to the link, here disapproval was steady at a over 50%. In fact, here disapproval rate was over 50% every day since 8 NOV 2021.
Some of her rise is people giving her another look and liking what they see. Some of it is explicit, "I'm a Democrat so I'm going to support whoever the Democrats nominate" and some of it is an implicit or unstated, "Well, the Democrats have nominated her and I'm a Democrat, so she must be alright."
Influence ops/PR/propaganda will be particularly effective at the latter group.
Look at the other side. Trump is not a particularly intelligent guy. He is not a very ethical person. Some loyal Republicans support him simply because he now has an (R) after his name. Some fall for the "Trump hugging the flag" propaganda.
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Drive around the Shenandoah Valley you you will see rural homes with Trump signs. What on earth do rural Valley inhabitants have in common with a New York real estate mogul? Why this level of connection? That is the power of propaganda.
Anyway, I think the Israelis should turn that power towards doing some good for themselves and the Palestinians.