there is apparent proof of dubious tactics in [...] their failure to call the election polling closeI just want to address this one point. I think it's just untenable to imagine there was some big conspiracy to skew poll numbers in Clinton's favour. Why would all the pollsters fall in line, why wouldn't anyone break ranks and leak the story? It would be a huge story that would sell a ton of newspapers!
The pollsters were mostly wrong, but they were fairly close, only a couple of points off. Just about everybody (notably the Princeton Election Consortium) was way overconfident, with the exception of FiveThirtyEight who gave Clinton a 70-30 chance over Trump. That's not a bad guess given the final result. FiveThirtyEight never claimed to be correcting anyone else's bias, they just clearly stated their reasons for thinking the result was very uncertain. It's a shame nobody else followed their lead but you can bet they will next time round.
The one big outlier was the LA Times poll, which consistently put Trump ahead, but they put him way ahead, so they were actually one of the less accurate polls in absolute terms.
It will be really interesting to see what caused that overall ~2% polling miss, but I would bet a large sum of money that it wasn't "dubious tactics". The worst we should accuse the media of is overconfidence. (For example, a few left-leaning outlets accused FiveThirtyEight of gaming the system in Trump's favour; that just makes them look stupid in hindsight.)