... and, about Trump to some extent ...
WikiLeaks founder, Julian Assange, wrote recently a remarkable analysis about Why the Democratic party is doomed. We could agree with most of it, except the last sentence in which Assange writes:
The Democratic base should move to start a new party since the party elite shows no signs that they will give up power. This can be done quickly and cheaply as a result of the internet and databases of peoples' political preferences. This reality is proven in practice with the rapid construction of the Macron, Sanders and Trump campaigns from nothing. The existing Democratic party may well have negative reputational capital, stimulating a Macron-style clean slate approach. Regardless, in the face of such a threat, the Democratic establishment will either concede control or, as in the case of Macron, be eliminated by the new structure.
From the three cases that Assange refers to, only Sanders is a "product" that came out of “nothing”, without the support of the establishment mechanisms, but purely with the support of the people from below and especially the American youth that indeed used successfully the Internet technology to promote Bernie.
Emmanuel Macron didn't came out of nothing. The 'darling' of the neoliberal establishment had full support from the mainstream media since the beginning of his campaign. Macron is literally a construction of the establishment. He might have lost, even from the Leftist leader Jean-Luc Melenchon (who has been 'beaten' by the media, like Jeremy Corbyn in the UK and Bernie Sanders in the US), if he didn't have so much support from the establishment apparatus.
As mentioned already, Macron is certainly the first priority of the establishment. Not only he comes straight from the banking industry which lies on the top of the pyramid of the financial elites. He is also the new model promoted by the neoliberal regime. A young technocrat without a political party. A post-modern apolitical figure totally compatible to the younger generations who were born and raised according to the completely apolitical culture, built by the regime, especially the last four decades.
But even Donald Trump did not came out of nothing. It has been discovered that Donald Trump, who was promoted as "anti-establishment", took more time coverage in the media, even compared to the definitely-pro-establishment Hillary Clinton! The explanation is simple: Donald Trump is just a reserve of the establishment as has been repeatedly supported by this blog (and has been proved remarkably fast), against the real threat for the establishment called Bernie Sanders.
So, dear Julian, from the three cases you mentioned, only Bernie Sanders' campaign really came out of nothing, with the pure support and mobilization of the American people.