i mean, it's not that hard to believe he lost largely because most USians are propagandized zionists (especially older people, who vote by far the most in local elections). advertising money doesn't guarantee anything unless you have something definingly different from your opponent (or no one knows them), and the election was very publicized in being seen as for or against israel. wrote this in another comment:

bowman already had a huge incumbent advantage and way more name recognition than most reps, so there's no reason to believe people seeing the other guy's ads more is the reason he lost (even if it certainly didnt help). if it were that easy, mike bloomberg would be president and all the other cases where interest groups spent ungodly amounts to unseat a progressive would've generally worked