How did this political climate come to be?

Per usual, Ross Douthat is in this post occasionally wise:

[Tuesday's] recall vote is not necessarily a bellwether for the general election, not necessarily a sign that Mitt Romney can win a slew of purple states, not necessarily proof that the country is ready to throw in with Walker’s fellow Wisconsinite Paul Ryan on issues of spending and taxation.

But neither is it anything like good news for liberalism. We are entering a political era that will feature many contests like the war over collective bargaining in Wisconsin: grinding struggles in which sweeping legislation is passed by party-line votes and then the politicians responsible hunker down and try to survive the backlash. There will be no total victory in this era, but there will be gains and losses — and the outcome in the Walker recall is a warning to Democrats that their position may be weaker than many optimistic liberals thought.