People overindex on this. Israel enjoys overwhelming support in both parties, and, for those unfamiliar with US politics, evangelicals belong overwhelmingly to just one of them.
Telling a pollster you support Israel isn't political suicide, and Americans consistently do that. It's political suicide for a politician to oppose Israel, because Americans like Israel.
There’s an immense gap between supporting Israel and a two-state solution and supporting Netanyahu and those positions should be confused. I fully support the two-state solution, but I don’t support Netanyahu and his genocidal policies.
That said, a lot of evangelicals do believe the world is about to end and are willing to pay to hasten the process.