He "legitimately" lost after they handed Iowa to a nobody loser like Pete to render Iowa irrelevant in the future. You don't really think Pete won, do you? Sure, they gave the appearance of "cleaning up" after Iowa, but that was always the plan! Now Iowa is done as a relevant caucus state.
I voted in Iowa. Getting my caucus vote made irrelevant showed me the Democratic Party is not a viable vehicle. They'll literally throw out your votes if they don't like it.