exit polling data can break down ideological differences
You have an extremely naive view of the world, thinking that exit polling signals the same thing that voting far left does. Constituents aren’t the only interest group politicians listen to, we actually have hard data that for the purposes of at least law making they entirely ignore us, and we have very little influence even beyond that.
The miniscule amount of influence we do have is the ability to remove one party from power. Exit polls come absolutely no where near this in terms of influence. When other interest groups want to continue the Palestinian genocide, and you have exit polls signaling that Democrats are against this (as exit polls have suggested for the last 50 years) then Democrats happily ignore this, as they have been.
We’re in a unique situation where the genocide is ramping up, and for some reason the American left has latched onto this issue (rightfully so, but still surprising). If we actually funnel this clearly into a signal that we will essentially sacrifice our wellbeing (e.g put Trump in power) just to draw the line that genocide support is unacceptable, we might actually see an anti-genocide Democrat for once.
Exit polls are entirely different. They’re fine in a world where there is no institutionalized interest in perpetuating some harm, and the Democratic party is split on some issue, they can look to constituent preferences. But as Joe Biden said best, if Israel did not exist in the middle east, the U.S would have to invent an Israel to protect American interests abroad. Preferences will be ignored without consequences for those in power, and if you think otherwise, again, you’re being naive.