Why aren't there more liberals in America?

It's not because liberalism lacks cultural power. Many polls suggest that a majority of college professors and national journalists vote Democratic. The movie, TV, music and publishing industries are dominated by liberals.

It's not because recent events have disproved the liberal worldview. On the contrary, we're still recovering from a financial crisis caused, in large measure, by Wall Street excess. Corporate profits are zooming while worker salaries are flat.

It's not because liberalism's opponents are going from strength to strength. The Republican Party is unpopular and sometimes embarrassing.

Given the circumstances, this should be a golden age of liberalism. Yet the percentage of Americans who call themselves liberals is either flat or in decline. There are now two conservatives in this country for every liberal. Over the past 40 years, liberalism has been astonishingly incapable at expanding its market share.

The most important explanation is what you might call the Instrument Problem. Americans may agree with liberal diagnoses, but they don't trust the instrument the Democrats use to solve problems. They don't trust the federal government.

A few decades ago they did, but now they don't. Roughly 10 percent of Americans trust government to do the right thing most of the time, according to an October New York Times, CBS News poll.

David Fuller's view In many countries governments are seen as the problem rather than the solution, although in democracies this can change around election time. Mitt Romney certainly sounded presidential following his comfortable victory in yesterday's New Hampshire primary, and again on CNBC's US Squawk Box this morning. Governor Romney, who I assume will be the Republican candidate and President Obama will offer contrasting visions for the country. It should be an interesting campaign.