Could be a last ditch effort to rally the Dem voters. From what I understand they absolutely hate the Republicans for harping on this "non-issue". I think they're trying to put the cat into the pigeons and boost turnout.
No what we have going on here is justice. There was no need for Comey to do this. He is being given a chance to do what he should have done to Hillary and Obama in the first place. Nothing more.