Delivery under Obama has been so scant that you would need an electron microscope to see exactly what HAS been delivered and in America, as elsewhere in the world, people see themselves as consumers with certain rights.
Issues like automation, robotics, cybernetics, 3D printing and the need for up-skilling, more exports and a more outward looking focus have not been addressed, so when Obama, or his equivalents around the world, says that policies are working, people compare their situations to what has been promised and find that they are being delivered what Trading Standards calls “short measure”.
This means buying a pint or liter of beer but getting less than half of it, whilst being charged for the whole amount.
In the past people would grumble, be fed lies and in most cases put up with what they were given but no longer. They want what they were promised, when it was promised to arrive, and preferably faster than that.
Politics is still in the age of horses and carts, rather than the internet age where every promise and utterance can and is being compared with earlier utterances and politicians by not managing expectations and by not delivering or explaining why they can’t (changed circumstances), risk approbation and ridicule.
Trump may be a buffoon and will not win the Presidency but Hillary Clinton will not be able to disregard some of the important points he has made however much she might disagree with the inflammatory way in which he makes his case.
The genie is out of the bottle, people want delivery and they want to see fairer distribution of wealth and the old norms are simply not going to be accepted any longer.