Depends on your viewpoint of the Electoral College vs Popular Vote of course.
In any case, its clear that Mr. Trump won with less money spent. Bernie Sanders is similarly a candidate who famously spent less money that Ms. Clinton but also had a chance.
The main issue is that these candidates (Trump and Sanders) were far more willing to participate in reality-distortion-field politiking, which is something that the mainstream candidates did not do as much. But that's a different debate... I would definitely argue that money has a role in politics, but it isn't as strong as most people think it is.