This race is really about how bad a two party system is. Trump and Bernie made massive inroads because neither party is delivering on their promises.
I am so sick of people who fail to understand our two-party system that I want to fucking scream. The small parties that exist in any parlimentary system (labor party, green party, consumer party, religious party, businessman's party, etc,) all exist in our system as well, but because first-past-the-post voting is our system, they all have to band together into the biggest coalition they possibly can in order to have a chance at winning. So the party primaries tend to produce candidates with very broad appeal across their respective side of the spectrum. Thus whoever wins the Presidency has at least 50% of the country supporting them to begin with, as opposed to a parliamentary system where the "winners" try to hash out a coalition post-facto and they pick a chief executive, not the voter. The "winners" have a much narrower segment of the populace behind them - a much smaller mandate - and the Prime Minister pick is the result of politicians doing horse trading, not the will of the people.
The fact that Bernie got so far - and that Trump actually bucked the establishment party entirely, like the Bull Moose before him - just demonstrates the flexibility of the system. The Scary Party Apparatus was unable to stand against him, because they stood against the will of the voters.
You need to learn how it all works, as you gain experience you become qualified for higher and higher end projects.
The entire history of our nation disagrees with you. On average, Presidents win the Presidency about 15 years after their first significant electoral victory. Long-time career politicians, like Senators, do not win the Presidency very often at all. (Obama didn't even serve a full term as a Senator before running for the top job.) That's because people don't vote for candidates with too much baggage; and career politicians have traded too many horses and used cars to be very convincing when they claim to have strong principles on this or that. The people who tend to win the Presidency tend to be powerful personalities with clear-cut agendas - and they are not, as a rule, career politicians.
This is by design. See Federalist Paper No. 70, specifically the concept of "energy in the executive." Congress is the domain of the deal-making career politician; where compromise rules and change is implemented very gradually. The executive branch was intended by the Founding Fathers to be a fire under Congress's ass; for the office - and the holder of that office - to provide the impetus and energy that Congress, by design, cannot have.
The President is not a god damned Prime Minister. They're not some balding bureaucratic asshole picked by other balding bureaucratic assholes. They're a powerful - and individual - expression of the popular will, and that's important considering the incumbency rate of Congress is over 90%. Please, I implore you, and everyone else - do some fucking reading about our god-damned political system before you sit there and spout off more fucking bullshit about how unutterably awful you think our system is. It isn't fucking rocket science. It's all available online. You can buy the Federalist Papers in paperback form for a few bucks off Amazon. You fancy yourself an educated voter? Go get the fucking education.