The story of secret Russian agents effectively swaying the U.S. election, or colluding with Donald Trump, has petered out into nothingness. For months we heard dark suspicions recklessly spread by news organizations. We learned of selective leaks from inside the Deep State — Obama holdovers or NeverTrumpers determined to wreck his presidency.Now there’s almost nothing left. Democrats hope to impeach the president for procedural improprieties. For clumsily firing a waffling and partisan FBI director. Still have Putin on the brain? You’ll have to settle for fevered claims by the likes of Louise Mensch that the Russian president, not ISIS,...