Earlier quoted context omitted.
Geopolitically they both hate iran. Culturally both are fairly similar - both are "western"-style democracies (e.g. representative democracies with constitutions that value rule of law, independent judiciary, etc) And, the following might be controversial - but many of americas strategic allies do much worse shit than israel, they just get called out on it less. Hell, Saudi arabia is literally murdering people in emb…
it'd also be good to mention that there exists a strong, largely right-wing and evangelical, pro-Israeli lobby in the US that make it politically very costly to not demonstrate unequivocal support
Look at abortion for example, do right wing evangelicals value this issue less than their support for a 10-thousand+-kilometer-away country? did they manage to make it controversial and costly to not adopt their position on it?
Right wing evangelicals do performatively praise Israel more often, but actual lobbying is strongly bipartisan and cuts across the conservative-progressive divide.