One side of the coin is a depiction of an elephant, which of course, represents the republican party.
The other side depicts a donkey, which of course is the democratic party.
No matter how many times you flip the coin, you lose.
That's why we're angry.

FDR had his 100 day whirlwind ushering in the New Deal. From Digital History:

In Roosevelt’s first hundred days in office, he pushed 15 major bills through Congress. The bills would reshape every aspect of the economy, from banking and industry to agriculture and social welfare. The president promised decisive action. He called Congress into special session and demanded "broad executive power to wage a war against the emergency, as great as the power that would be given me if we were in fact invaded by a foreign foe."

JFK said that we will put a man on the moon in the decade of 1960.

Here are some goals for the next ten years:
1) Median real household income will increase by 25% and every able American will have a job
2) CO2 emissions will be cut by 50%
3) Elections will not be financed by the wealthy or by corporations
4) Health care will be a right
5) Education through 16 years will be a right.
6) Job training is a right
7) Equal pay for equal work is a right
Eight) The US respects international law, that the military can only be used for imminent defense or common goals enumerated by the Security Council.
9) ...

You get the point. I'm angry because there is almost no movement towards these goals, instead we have become a totally regressive society supporting the status quo of wealth and power. The word regressive may not be strong enough, perhaps reactionary. I can enumerate my frustrations, but I think that most people sense that something is terribly wrong as we keep doing everything the same way and get the same results, that is ... no progress.

Angry because too many Democrats act like Rethugs, or they're in cahoots with Rethugs, to give corporations, banks, the religious reichwingnuts, Wall Street, the military-industrial-mercenary complex too much business (and it's largely illegal and unconstitutional, to top it all off; they violate their oath of office by catering to those interests). All Dems have been for the last quarter of a century is "the lesser of two evils." Enough, already.

Angry because our legislators ignore us once they're elected. That's why we got that corporate hash known as ACA/Obamacare, and before that (under Dumbya) Medicare Part D. We all wanted something sensible, like a buy-in to Medicare (which would be cheaper than corporate insurance with deductibles), plus which there needs to be negotiations for drug prices and no deductibles for those of us who buy drugs necessary for our health. Instead, we got lame excuses like "the other side just won't go for it and we don't have the numbers." (I've never figured out the pre-counting behind the scenes, only voting on legislation if they know in advance what the vote is going to be. No one is in chambers when these clowns speak, so there's no swaying the minds of anyone when Congress is in session.) Even Dems glad-handed the corporate version(s) and lauded themselves for passing that tripe. Ugh. SCOTUS can use pretzel logic to re-name insurance premiums paid to a corporation as a tax all they want, thus eliminating the "middleman" (i.e. the US government paying insurance instead of us), that still does not render our money paid to corporate insurance companies a tax. It does mean that we are forced, by law, to contribute to the profit margins of corporations so they can pay their shareholders, pay out obscene amounts to their CEOs as bonuses, buy company jets, provide all-expenses-paid vacations to their executive officers, and the like. THAT is truly obscene. Switching over to a government-administered not-for-profit single-payer Medicare for ALL would be so much simpler and save m/billions of dollars for We the People. Even if we pay more for Medicare withholding (via paychecks and Social Security), it would still be far cheaper than paying insurance companies and/or outrageous amounts for prescription drugs.

Plus: Jobs, jobs, jobs. Switching to Medicare for ALL means hiring US residents to handle the increase in paperwork. Their paychecks would mean increases in local, state, and federal tax revenues. Sounds like a win-win situation to me.

The largest SNAFUBAR would be TPP, since pharmaceutical corporations would be one of the biggest beneficiaries for their patents, copyrights, trademarks, and selling their pills/meds for huge amounts of money once they have exclusive marketing rights. See the Hatch-Waxman Act:
https://en.wikipedia.org/wiki/Drug_Price_Competition_and_Patent_Term_Res...
https://en.wikipedia.org/wiki/Research_exemption
I got caught in that nonsense with one of my meds, see History:
https://en.wikipedia.org/wiki/Colchicine#History

Most of all, I'm extraordinarily angry because so few of our legislators seem to possess any common sense. They certainly don't use it if they even have it. WTF is behind electing legislators who are known religious freaks who want to pass legislation to control women's bodies?!? Adding insult to injury, letting these freaks attach amendments for accomplishing just that to "must pass" legislation, like budget bills. There is a serious disconnect between logic and the belief systems these idiots want to impose on us, all contrary to the US Constitution's separation of church and state.

I could go on and on and on and on some more - and have done so in the past. Suffice to say, I'm really tired of so many of our elected Representatives and Senators being such awful crooks because we are only given the choice to vote "for" the lesser of two evils.

is that much of the American public goes along through life fairly unaware of Governmental influence other than police and taxes. Unless there is a harsher nudge. Then really angry.

Every few years we are asked to pick-a-team to not bother us. There is Super Bowl TV hype to split the Read Sea and drive the rah-rahs. And then it's done and Nothing.Really.Happens that overtly affects the majority. So things slide.

Back to Super Bowl hype (or at least playoffs leading up) and suddenly many sense in 2016 something is Wrong, and some of those understand that it is like changing course in a 1000ft Laker (ship, not bb team) before it hits a bridge. Some of the division of this year's rejectionists (T or S leaners) just do not agree Port or Starboard.

It's an ages old reaction to stress.
The people in America are terribly stressed.
As if the economic and societal stresses weren't bad enough. The people are under constant surveillance and their communication are monitored, and they know it.
It's an evolutionary and evolution produced reaction.
Much the same as the lion in the dark. You can't see him but you know he's there, and you know he knows your there and you know he's hungry.
I think 'They' have miscalculated.
Bernie or bust.