I take your point on the photogenic aspect but if you look at the rhetoric from the campaigning and pamphlets of days gone by there is plenty of appeal to populist positions. I guess I'm not sold that the medium is actually the source of the problem.
Tl;dr = America has a problem if the "Abraham Lincolns" of today are no longer electable.
Full version: I think you're confusing my position as being based on populism, when really it's all about the photogenics. Basically goes like this:
Candidates are elected today based on factors such as their appearance and body language relative to their opponents in a way that didn't use to be a factor. You can very often predict an election's outcome based on candidate body language.
This has the effect of allowing the electorate to "know" the candidates better, like an interviewer meeting potential applicants and being, knowingly or not, influenced by their body language. Some U.S. government agencies even train their interviewers to recognize and account for these innate biases in order to make a more accurate job selection, but naturally this will never happen for the general population.
So we have a situation now where factors such as "TV presence," "celebrity-like aura," and "winning smile" powerfully influence elections. Candidates to whom it doesn't come naturally often invest in body language training to appeal to the electorate.
While good candidates are often still elected (I think Obama's been an excellent president), these factors are disproportionately influential compared to knowledge of the philosophy and practice of government administration. So two things happen:
1. We're more likely to elect ineffective executives.
2. We're more likely to disregard people who would actually be excellent presidents. James Madison was too short to ever be electable today. Abraham Lincoln was too tall, ugly, and awkward. 1960 was the year of the first national presidential debate. How many other excellent pre-1960 presidents (the year of the first televised presidential debate) would we have missed out on based on this?
Corollary 1: The two worst presidents in American history (Buchanan and Jackson) were both pre-1960 and we had a number of incompetents all around back then. BUT, I do think that, going forward, treating presidential elections like high school popularity contests (Reagan/Bush2 are the easy targets) has been biting us in the ass and will continue to do so going forward.
Corollary 2: I don't think Donald Trump would even be a factor if it weren't for his star presence and the media frenzy around him. A candidate like this could conceivably win the whole election purely based on media attention–even
negative media attention can help him so long as enough of his base is exposed to him and votes. If the media would stop focusing on him, there'd be no issue, but Donald Trump gives ratings, so the media won't shut up, so they'll keep criticizing and he'll keep benefitting from the attention.