The one thing that annoys me most about this isn't about who is doing the hacking, but how horribly the DNC had failed at security. Nobody has been talking about this and I find it annoying to see nobody has been focusing on greater security.
What makes you think they failed terribly? We haven't seen full analysis (or much of anything yet), but there are mentions of potentially specially targeted malware. Very few organizations will withhold a direct targeted attack by a government which possesses zero days and resources to hand craft attack software and can find personal information of specific people attacked.