“The margins the Russians needed to change in key states during the 2016 elections were pretty small. Now we know how they were able to be so precise: Paul Manafort was providing polling data to Russia” via GRU Agent Konstantin Kilimnik.
GRU ꟷ Russian Military Intelligence. “It’s a permanent affiliation. There’s no such thing as a former GRU officer”- @BillBrowder
“To anybody familiar with Russian intelligence, Kilimnik was very likely Manafort’s spy-handler.”- John Schindler, 4/2/18
If Mueller had some evidence that election totals were altered in one or more states, but he couldn't prove it beyond a reasonable doubt, would he (or anyone at DOJ) keep it hidden?? I think they would keep it hidden.