Figuring some of my readers may be asking this, I thought I'd provide an answer.
Perhaps a few points, 1 or 2, maybe even enough to swing 2 or 3 swing states (ALL of which are currently leaning towards Clinton) but not enough to swing the election.
If Clinton loses, it will be because of more than just this latest e-mail scandal.
Edited to add: How bad could it be? This bad: