In the Sunday Washington Post’s 7,000-word account of what President Obama knew about Russian election meddling and what he did about it, one absence is notable. Nowhere in the Post’s lengthy tick-tock is Mr. Obama presented with evidence of, or described as worried about, Trump collusion with Russia.

Moscow intervened in the election eight ways from Sunday, but it’s clearer than ever that what’s occupied Americans for the past six months are baseless accusations about the Trump campaign.

Among...