I'm really interested in reading any major newspaper that endorses Trump, if one exists.
Do people still read blogs that come in this antiquated paper format?
On a more serious note I would imagine that very few would even think about it. Most of these newspapers are owned by a handful of big corporations.
If those corporations can be happy with either candidate then they'll allow their papers to endorse either. If they want one candidate and are dead set against the other then no such latitude will be required (not that they'll need close instruction - the editors they hire to run these hack blogs are not hired for their great independence of mind and bold thinking).
The New York Post endorsed Trump in the primaries so they might endorse him in the general if Murdoch wants them to.