Voters—democrats especially—are voting against politicians that don't speak out against Israel. But that's a very recent phenomenon. Democratic leadership strongly supports Israel to this day, including both Schumer and Jeffries. Cory Bush and Jamaal Bowman, both outspoken in criticism of Israel, were each primaried by democrats with support from leadership, and Bell (who ousted Bush) promptly lost in the general. That is—they willingly gave up a house seat just to ensure a pro-Israel party line.

As I said, things are changing, but it's still largely verboten to speak baldly against Israel as a democrat. In the senate, there are people who oppose arms sales to Israel, largely because of the Leahy law prohibiting arms sales to countries who commit war crimes, but few speak strongly against the clear slaughter (let alone describe it as a genocide as the rest of the world seems comfortable doing), or ascribe it solely to Netanyahu. This, when democratic voters mostly do not have a favorable view of Israel, seems to be a fundamental failure of representation.

On the republican side, Massie and previously MTG were opposed. Only about 43% of republican voters strongly support Israel. I don't believe any senator opposes arms sales to Israel. Again, this seems like a failure of representation.

To characterize this as a symptom of evangelicalism is historically understandable, but young evangelicals do not follow this trend, and even historically it's only a small part of the story.

But, americans rarely vote based on foreign policy (something like 3-5% of americans depending on the election). That we well and truly are culpable for.