Right now, a narrative is being spread that the attacks came about as a result of a hacked yahoo email account. This could in fact be the case, it is a plausible explanation.

I am not convinced.

Yahoo is a perfect scapegoat. It is currently being sold to Verizon, so it has nothing to lose, no reputation to be hurt, no damage from a breach.

However, the Clinton emails have demonstrated that she was extremely well connected to people in the DNC, and to people with massive connections globally. This was an unsecured server, and it would have given state sponsored actors more than just access to US secrets.

It gave them the names of people, who their connections are, who they work with, what their psychology was, and avenues and targets for further cyber attack.

As such, the nightmare scenario that i propose is that ALL the dnc, and major democrat politicians and business donors have been compromised. That they have been compromised as a direct result of Clinton's server being compromised, or that weak security points among people with connections where ascertained from her emails. The DNC leaks are an expression of power, and are being used as a brokering tool to both demonstrate that the foreign power has dangerous knowledge, and is not afraid to use it.