Why is this primary getting so much attention over Israel?

The policy stakes are the clearest explanation. Massie has opposed U.S. military aid to Israel, and the reports say he proposed requiring AIPAC to register under a foreign-agent law. Groups that prioritize U.S. support for Israel have reason to back a candidate more aligned with their position.

That describes political advocacy around U.S. policy. The reporting summarized here does not, by itself, show that Israel’s government is directing or funding the effort.

It’s also being treated as a test of influence inside the Republican Party. A primary can signal whether a candidate who breaks with party leaders on Israel can hold a seat, and donors may see spending there as a way to shape that signal.

That’s different from saying the result will settle the party’s position, or that every donor has the same motive.

I’d be careful with the phrase “Israel is invested.” The accounts describe coverage in Israeli outlets and spending by pro-Israel organizations and donors. Those things can make the race a major story without proving the Israeli state is intervening.

There’s another distinction worth keeping: criticism of Israeli government policy or U.S. aid is not automatically antisemitism. The reports also mention separate accusations about Massie, so those should be assessed on their specific evidence rather than treated as the same issue.