Would an endorsement by Israeli Prime Minister Benjamin Netanyahu help or hurt Romney?

[agentS]

9. If circumstances were different, then it MIGHT have worked

Things would have to be VERY bad between US Jews and President Obama before an endorsement of Romney would help.
Something akin to not supplying arms during an Egyptian invasion, or an accidental shoot-down of an airliner or ship sinking.
And EVEN THEN it might not swing all the Jewish voters (and cash) that Romney would need to win. Netanyahu ain't exactly a popular person here or there right now- and the circumstances listed above or similar situations would not have occurred in a vacuum- i.e Netanyahu ordering something stupid, thus causing the situation. Young voters are probably soured on him, short of an Iranian nuke strike on Jerusalem.