Biden is a mainstream Democrat, and he doesn't represent America's left. Sanders supports some of the positions of Israel's left, but is mostly silent in supporting explicitly embracing Israel's left. The number of Palestinians who do not support a two state solution is as detrimental to it as the number of Israelis, but it is, regardless of popular support, inevitable, in one form or another. It is political reality, not a sentiment.
What I was talking about was the absence of solidarity with and explicit support for Israel's left. How many left wing activists and politicians ever openly embraced a Meretz politician? How many of them expressed unwavering support for a democratic secular Israel? How many of them made an effort to appeal to undecided Israeli voters for supporting Israel's left? How many pushed back on the ridiculous accusations of Zionism and the nation of Israel being complicit in genocide, apartheid and ethnic cleansing and being a fascist state? How many pointed out that the source of this propaganda is the right wing regimes in the Arab League, Iran and as far away as Russia, in addition to the traditionally antisemitic elements in Europe? Very few and far between, drowned by the loud voices of those who at this opportunity are taking advantage to exploit the tragedy of Gaza to promote their age-old Jew hatred.
Meanwhile, the right wing religious zealots and bigots in America expend tons of resources and considerable political capital in propping up their kin in the Netanyahu's ruling coalition.
The margin of of support for the current government in Israel is razor thin. Rather than increase the odds of toppling Netanyahu's government, it seems to me that America's left is alienating enough Israelis to turn the odds in Netanyahu's favor. I see how this benefits the Islamist regimes across the Middle East who, while fighting among each other for dominance, still find Israel a useful distraction. I see how this benefits traditional antisemitic elements in Europe. But I don't see how it benefits a secular democratic Israel, or Israel's political left.