Obama used it to inform people about his polcies and get the out to vote. Trump used it to spread lies, falsehoods and half-truths. Essentially any media that was outlandish enough to become viral was promoted and promoted to hapless people who probably might have wondered why they were seeing so many distressing articles about America in "Carnage" (as Trump puts it).
At most this is your own political standards. Not anything that can be neutral and objective. Claiming one set of political ideas to be "right" is very dangerous.
Just because something is political and not neutral does not mean that there are no facts associated with it. We may disagree on them, debate them, but to take the stance that there are none at all is the kind of tactic used by people who do not wish to debate the actual validity of their viewpoints.
Technically, there might be little difference, but Bannon clearly excels at using this tool to a greater effect, and the result is far more impactful and outreaching, even revolutionary. Guaranteed, other groups will take notice and trying to replicate their success, to feed their version of personalized agenda to your month.
And now we have the Chaotic President, thanks, Bannon.
If advertising isn't manipulating and brainwashing, what is it? As far as I can tell, advertising is precisely that.