Because many citizens feel that the system is broken, that it has failed them.
That voters choose their candidates via mass-marketing and PR campaigns.
We also resent being manipulated, whether by (what-to-) think tanks, or propaganda?) radio/TV talk shows, etc.
Government and its issues are too complex; too many riders, "signing" statements, and hidden agendas; media is too biased; information too undependable ....
Who and what do we believe? Furthermore, "absolute thinking" reigns.
Taxes are never low enough, gun control loose enough, or a Democrat/Republican good!
There is also the concern that "new" candidates will eventually become part of the problem.
Politicians no longer have a loyalty or devotion to their constituency or office.
This may be a self-fulfilling prophecy, where "public office" is now synonymous with waste and inefficiency. The term "civil servant" no longer has the prestige it once had when loyalty was to the greater good, to the collective best interest of this country, to all citizens, not just a few (or somebody's bank account). Neighbors and fellow citizens mattered.
Servicemen have this same loyalty, even potentially at the cost of their lives. Corporate loyalty is to their bottom line, shareholders, making a profit, and reducing expenses (i.e., pollution, safety, employee pay/pensions/insurance, fines.)
Enter campaign contributions. Behind every corrupt politician, there is a corrupt businessman. Corporate money is what controls this nation now, not any political or governmental process. The middle-class has been abandoned.
The godlike "invisible hand" is invisible because it isn't there.
Milton Freidman devotees still believe government is doomed to fail, and needs to fail, in order for the private sector to rise to the challenge, and "save us." Voting for them is like hiring a vegetarian at the only steakhouse in town, or riding with someone who wants to wreck his car, so he can collect the insurance.
-- D. L. (ANDY) ANDERSON, Richland