trump is a loose cannon. Biden is fully controlled. He's also on the left, and Israel needs to start gaining more influence there. No better way to start putting more pressure on dem senators to be more pro-israel than having their president telling them to do so, or at least risking some commie like Liz Warren from claiming the presidency (lol). Honestly I doubt they cared too much who won once they had it as biden vs trump and just allowed it to play out.