Maine and Nebraska are the only two states which do not award winner take all for the entire state.
Maine dedicates two points to overall winner of the state, and then gives each congressional district within Maine (there are two) a single point for the winner of that district.
Biden won the vote in District 2 and he won it by such a margin that he also won the overall state count. He lost the other district which went for Trump (it's more rural), so it was split 3 to 1.
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