They aren't politicians, they donate their
money to charity and other causes they like.
This is the most generous description of the Kochs I have ever read. They are planning on spending upwards of a billion dollars in the next twelve months to elect public officials who support their policy objectives[1].[1] http://www.salon.com/2015/01/27/this_is_the_legacy_of_citize...
You (and I) may disagree with the causes they find important, but that's a somewhat different topic. The article points out many, many instances (or rather intimates they exist) where _policies_ are immune from criticism -- my concern is when _people_ are criticized. There's no public policy value in humiliating someone, and it's happening anyway.
The difference is it's something that benefits the many, as opposed to the few
There's a big difference between publicly supporting Bernie Sanders because you believe he'll be a good president and skulking around in the corridors of power buying off officials so that you can line your own pockets.
Right now in the US almost all the income taxes are paid by 20% or so of the population. People who advocate a bigger, more expensive government are almost always planning to do it with someone else's money.
Did you read the article? It talks about how Koch donated to an economics department at a public university in return for having a say in who gets selected as a professor every year. That's a different form of donation than the common citizen's congributions to political campaigns.
Suppose 1 person had all available money to "invest" toward their politician of choice. All other citizens on earth are busy scraping by on minimum wage, in debt up to their ears, working for this one man who essentially gets to choose who gets elected because no one can put a single penny toward another candidate or his/her legal team to get through all the loop holes necessary to get onto the ballot, etc.
How is this a "fair" representative democracy?
Sure it's not at the point today, but one could imagine that without limits a political system's integrity can be upended through manipulation of its own structure.
Better would be to get all money out of politics, but until we get there, surely Sanders' donations are a lot more democratic than those of the billionaires' favourites.