And how's that working out for them lately?

Still really well. The Democratic party is a vastly better fit - ideologically and demographically - for American Jews than the Republican party. The GOP coalition today contains most of the rural, Christian, nativist, and anti-intellectual strains of the electorate. That's a hard coalition for a religious minority immigrant group to fit in well with.

To the extent that there's a schism over recent events in Israel and Gaza, it's not really between Jews and Democrats writ large. It's within the hardcore progressive left. You have a bunch of very progressive (and mostly younger) leftist Jews that had made common cause with the broader progressive left on a host of issues - including fighting Israeli settlements in the West Bank, agitating for better conditions in Gaza, and pushing for a two-state solution. Those Jews generally assumed that while the settlers and the Netanyahu supporters were bad guys, their non-settler Labor-supporting Jewish Israeli friends would be considered part of the solution. They were in for a bit of a nasty shock to find that support for a one-state solution - just Palestine - runs deep in hardcore progressive circles.

But that doesn't mean that the Democratic party as a whole isn't generally far better for American Jews than the GOP. Being distressed by progressive attitudes towards Israel doesn't make the base GOP project of a Christian Nation any more appealing to us. And generally speaking, on a host of other issues Jews generally fall more within the Democratic coalition than the GOP coalition - of major religious groups, Jews are least likely (less than Buddhists!) to own a gun, most likely to support abortion, most likely to live in an urban area, third-most likely to have graduated from college, etc.