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50-50 is about ending the war or reclaiming lost territories.
Polls about US support in your link is : “Americans are also split as to whether the U.S. is doing too much (37%), the right amount (31%) or not enough (30%) to aid Ukraine.”
So 37% : “we should do less/abandon/be against Ukraine”
and 62% : “we should continue to back up Ukraine”
How can we know for sure that it is an error ?