There is no conspiracy.
Conspiracies, when they happen, seem to rather often fail; those requiring secrecy are in particular prone to failure. But people act according to their own interests all the time, and when their interests are even slightly aligned the outcome can certainly resemble or even be indistinguishable from an actively-managed conspiracy.
That being said, don't underestimate the amount of ordinary collusion and the work of spin doctors during election times. My point is that this is massive this time, definitely more than in past elections.
Finally, although I generally agree, a little warning about your last comment: Since we only see failed conspiracies, we lack the data to adequately assess the question of how much real conspiracy there is. ("conspiracy theories" on the other hand, are easy to debunk, but that's another issue.)
At a certain point there is evidence to show people in the media coordinating in private to try and reach a common outcome. If a bunch of people in the media working together to distort the truth isn't a conspiracy then I'm not sure what is.
What really bothers me is not being able to watch any national news coverage without a constant stream of Democratic narrative. I'm genuinely curious about what other issues or political offices are going to be on the ballot, but I'm going to have to take it upon myself to research any of it. Maybe that's a good side-effect though.
Most of them are biased against Trump, of course, and follow a fairly obvious strategy: "Hillary is extremely unpopular, we cannot make her more popular, so let's make Trump even less popular."
It works very well. Just to make this clear, I'm a European left-wing liberal democratic socialist, not a Trump or Hillary supporter of any kind. But I've seen many US elections and it was never like that before. It's as if all US media and news organizations have sold out to the highest bidder at once. (To be fair, I don't follow that many of them, just a few newspaper sites like L.A. times, NY times, TV channels like CNN, Fox, nbc and a few social media sites.)