Is there reason to belive security was the problem as opposed to say just poor scaling?

No there isn't. The person running things in Iowa stated to the press that there is no evidence of a security issue, only a technical issue.

Those aren't "incumbents" in anything except the Democratic Party bureaucracy. I mean, I'm fine with dumping them (and, pretty much any bureaucrats in any organization), but they aren't "incumbent politicians", and you can't get rid of them with an election.