Yes, the majority of them did, but certainly not all, especially the American Jews actually living in Israel.
He will not have Israel's best interests in mind.
True. Hopefully, the Israelis con somewhat comepensate for the American election results by seeing to it that Natanyahu will be the next Israeli PM as a result of Tuesday's election.
We probably should all always keep in mind that the existence and survival of Israel may be important to most Jews (and I believe it is) but that it isn’t usually a foreground issue, particularly for younger Jews. If Israel were destroyed, its refugees would find an outpouring of support (including financial support) among American Jews.