You can’t get to a progressive candidate this way. A more progressive candidate is going to pull votes more from the left than the right. If you project the results at the point where the progressive candidate starts to matter they just tank the Democrat.If they take 80% of Democratic voters they just lose every state.
In brief the Israelis stole the Palestinians land both historically and literally continuing to this day. The Palestinians have both historically and to this day retaliated with horrific acts of violence often against women and children. Both sides are immoral shitbags who are fighting for reasons that have absolutely nothing to do with the US.
Arguably at this point Biden/Harris could pull out all the stops and pull all support for Israel in hopes of influencing their decision making. This would probably cause the Democrats to lose the election bringing in the guy who wants to build condos on the rubble and the bones of all the dead Palestinians.