This group, what I call the yeoman class — the small business owners, the suburban homeowners , the family farmers or skilled construction tradespeople– is increasingly endangered. Once the dominant class in America, it is clearly shrinking: In the four decades since 1971 the percentage of Americans earning between two-thirds and twice the national median income has dropped from 61% to 51% of the population, according to Pew.

Roughly one in three people born into middle class-households , those between the 30th and 70th percentiles of income, now fall out of that status as adults.

Neither party has a reasonable program to halt the decline of the middle class. Previous generations of liberals — say Walter Reuther, Hubert Humphrey, Harry Truman, Pat Brown — recognized broad-based economic growth was a necessary precursor to upward mobility and social justice. However, many in the new wave of progressives engage in fantastical economics built around such things as “urban density” and “green jobs,” while adopting policies that restrict growth in manufacturing, energy and housing. When all else fails, some, like Oregon’s John Kitzhaber, try to change the topic by advocating shifting emphasis from measures of economic growth to “happiness.”