Unfortunately, that isn't likely to happen. Netanyahu has, to date, handled Trump deftly and Rubio's current presence in Israel seems to be aimed at offering support to the ground offensive, not opposition. I honestly have no idea what kind of backlash it would take to shake U.S. support for this genocide.
It is worth noting that Andrew Cuomo, in a desperate last-minute gamble to boost support in the NYC mayoral race, has come out against Israel. Considering that much of the attacks on Mamdani have focused on his support for Palestine (construing him as antisemitic), it's notable that other candidates also seem to think that being anti-Israel is actually the vote winner for moderates right now.
I understand that that's the current shorthand, but it seems inaccurate and unnecessarily polarizing to me.
I think you're overthinking this. We're taking about a country committing genocide here. You either support them or you don't.