The Jewish vote has an influence in American politics, but on the settlement issue very little. A strong majority of American Jews do NOT support Israel's illegal settlement policies. It's only Orthodox Jewish-Americans that do. They number about 600,000 people out of about 6 million Jews in total.

In American politics, the overwhelming support for Israel's illegal settlement policies come from Christian fundamentalists. There's maybe 90 million of them, and they are even more religiously motivated on the issue than Jews.