Needless to say, this is absolute bullshit.
How did we get here? How did we get to the point where the electoral contest to run the most powerful government on the planet is between a racist demented right-wing authoritarian warmongering rapist and another racist demented right-wing authoritarian warmongering rapist? How in the hell did this bullshit happen?
There are a number of factors, including anonymous and unsubstantiated "leaks" from the US intelligence community regarding Russian support for the Bernie Sanders campaign and a shockingly coordinated maneuver by Democratic Party leadership (including former president Obama) to sabotage Sanders in the late hours before Super Tuesday.
But the primary factor by far was domestic mass media propaganda. Propaganda during the primary season of course, with the billionaire press showing a very clear and undeniable bias against Bernie Sanders from the very beginning of the race.