Justice Ketanji Brown Jackson

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19. Even if Democrats get a majority

It's unlikely that Jackson becomes Chief Justice. It's easier to just put a new Justice on and make them Chief than to promote a current Justice to Chief. Only five of the seventeen Chief Justices were Associates first, and Charles Evans Hughes had actually resigned to run for president in 1916, so he wasn't still on the court when he was nominated to be Chief in 1930.