US support for Israel continuing the current conflict or US support for Israel in general? If really forced into it, maybe the Democrats can withdraw their blessing for the current conflict, but I don't see how they could end support for Israel. If Putin wins the US election who knows what could happen but short of that Israel is just too important to the US empire and they know it. I mostly believe the official line from Washington that they don't have that much leverage against Israel - in the sense that Bibi&co have enough counter levers to make acting against them more costly than it's worth for the Democrats.
Hence the bullshit antisemitism law, the brutalizing of campus protests, etc. Democrats are even willing to drive down turn out among their base in one of the most important elections in US history over this - I just don't see them doing that if they had a better card to play.