I would like to suggest that the fundamental driving problem in American politics is that America no longer values humility.
Conservatives are looking for the solution to this problem in religion, which after all views pride as a sin, and therefore values humility as a virtue. But in an America that does not value humility, the "pride is a sin" version of religion is hard to sell. Everyone knows that social skills, charisma, and a touch of arrogance, rather than humility, are what you need to get ahead. Therefore, American conservatives mix religion with a "wealth is virtue" ethos which waters down the value of religion. Liberals are (rightly) disgusted by this, but perhaps conservatives see this as a compromise that has to be made in order to get people to like religion at all.
Liberals, on the other hand, are proud of being smart enough to recognize that "intelligent design" is nonsense. They make up fables about the "flying spaghetti monster" to prove how stupid conservatives are. Liberals want to solve the humility problem by redistributing income so that everyone is actually equal. Trouble is, income inequality has been increasing from 1970 to the present. It has been getting worse and worse. So people perceive liberals as being hypocrites, Liberals talk big, but don't do enough. When they do try to do enough, they are labeled "socialists." Perhaps people hear liberals saying "We want to transfer money to the poor," and interpret this as paternalistic and insulting. Liberals are "talking down to" the poor. If you are getting welfare until your income is equal with that of a doctor, but you lose your dignity in the process, then you are really no better off than when you started. This is especially true when liberals make a huge deal about evolution, and how stupid conservatives are for not believing it. When people complain about the "liberal elite", this is what they are concerned about.
I suggest this is what drives the tea party's intransigence over the deficit issues, i.e. there is something they value more than America's financial success. When liberals tell them that "smarter people than you, like Paul Krugman, know that you are wrong," this obviously infuriates them even more. This is a dangerous state of affairs. If people don't believe in evolution, but they are wrong, then there is not really any harm done -- at least not in comparison with the other big science issue, namely global warming. If people disbelieve in global warming just because liberal elites are too superior, then there will be real consequences to the whole world.
What is causing this humility deficit? I don't know. Part of it may be that we have been unsuccessful at making different social groups get along. There is distrust between whites and blacks, between theists and atheists, between rich and poor. When America splinters, charisma becomes valued over humility, because charisma is what's needed to reach out to people who don't trust you. This leads to a decrease in social capital. (I have heard of a book called "Bowling Alone" about this, but have not read it. From glancing at an online summary, I am guessing he believes that the welfare state is not a solution to the problem, and will not make people trust one another even if it remedies income inequality. He does believe that religion could be a solution, as long as it's tolerant of other religions.)
What do you think?