In the Illinois 9th, AIPAC supported candidate seemingly at random in an attempt to split the progressive vote and clear a path for Laura Fine. Didn't work there either.
It may very well be the case that Israel is disfavored by a strong majority of Illinois Democrats (I'd certainly understand why). What your analysis misses is salience: people care about lots of things they don't vote about. Poll primary voters here; you will find a small group of them that think Israel is the most important issue in the district (they will be almost uniformly white PMC voters and they'll be disproportionately online). Mostly you're going to find voters that (a) hate Trump and (b) are concerned about the economy.
It's clearly not the case that "anti-genocide candidates" enjoy a 90% share of the Illinois Democratic primary electorate, because they didn't win.
Davis was a progressive but has a more mixed record on Israel funding and defence bills. He's concered with what he has called a "humanitarian crisis", which is more than most, but never gone so far as to use terms like "genocide" or "ethnic cleansing" AFAIK.
Davis faced challenges in 2024 but won pretty handily. One of his challengers wasa the future 2026 AIPAC chosen candidate, Melissa Conyears-Ervin. AIPAC indirectly (eg through UDP) spent millions [1] in the IL-7 Democratic primary and still came in third.
So, IL-7 in 2026 was a massively funded primary in an open field with no incumbent and 2024 was a 14 term incumbent seeking reelection without massive spending. In what way are they comparable?
Bonus question: if millions are spent to oppose a candidate and they still win, how can you say the results were "identical"?
[1]: https://chicagocrusader.com/la-shawn-ford-wins-7th-district-...