Special Counsel Robert Hur’s report letting President Joe Biden off the hook for his handling of classified documents dropped a bigger problem than a prosecution in the White House’s lap: a withering portrait of the 81-year-old commander-in-chief as a man whose elevator may not go all the way up. Hur makes clear that Biden’s mishandling of national secrets isn’t equivalent to Donald Trump’s. The former president went to great lengths not to cooperate with investigators; the current president cooperated fully. The former president asked others to destroy documents and then lie about it; the cur…