Actually with US Jews, abortion trumps everything else. Ask any of them, they could care less about Israel, its the last thing on their list, #1 is making sure that women can still murder their babies
What's interesting is that liberal American Jews' support for Israeli military action depends on which party the PM at the time belongs to. If it's Labor, then the support is virtually unanimous. If it's Likud, support is less enthusiastic.
But you're right that among liberal American Jews, abortion is always at or near the top of political concerns.