No. Putting aside for a moment that this is simply negative campaigning and not "voter fraud". I mean, their strategy for "vote suppression" is to bring up Clinton accusers at the debate to discourage women, to say that Clinton has been horrible for black people, and to hammer on Wikileaks to discourage Bernie supporters. None of this is working in the first place! And they have no data to indicate it will.
The fact they call it voter suppression is fucking stupid. But yea this shit isn't working and it's too late for this.
And instead of telling your base to go out and vote you resort to this. This is the only way they can "win"