Sounds perfectly alright to me. Remember that there are levels of classification. Unclassified (the lowest level) could be running through Gmail in plain text for all anyone at the White House cares. Anything of even minute importance will get a classification status. (Also, Re: the NSA—they do the government's COMSEC , securing the classified data. OPSEC, the risk/reward policies regarding what data should be classi…
In today's political climate, it doesn't really have to be "classified" for it to damaging. All they need is an email of the president making some sort of offbeat joke about conservatives or something, and that would be a major crisis for him once the media gets their hand on it. It's stupid, but that's just how it is.
The president is no doubt instructed on the level of security he should expect from non-secure channels. I would hardly feel bad for politicians vs maybe some young teenager in highschool who doesn't yet know any better.