Most Presidents come into office shekeled to the hilt in one way or another. Hence most US Presidents owe the Jews bigtime for their election. The Jews bribed them. So they don’t want to offend this group and the only way to do that is to support Israel to the hilt.
Lately support has been plunging among Democrats and young people, even young Jews. The Jewish Establishment in the US (some of the worst humans on Earth) is visibly worried about this trend. There are all sorts of projects to reverse this trend. The disgusting ADL headed by Abe Foxman is in the forefront of most of these efforts. They usually involve some sort of lying, cheating, stealing, sleazy hardball amoral tactics, fakery, conspiracy, saying one thing and doing another, etc. They can usually count on the US media and the US government to mirror whatever the Hell it is that the US Jewish establishment wants to do.