Thomas B. Edsall writes: The conservative agenda, in a climate of scarcity, racializes policy making, calling for deep cuts in programs for the poor. The beneficiaries of these programs are disproportionately black and Hispanic. In 2009, according to census data, 50.9 percent of black households, 53.3 percent of Hispanic households and 20.5 percent of white households received some form of means-tested government assistance, including food stamps, Medicaid and public housing.

Less obviously, but just as racially charged, is the assault on public employees. “We can no longer live in a society where the public employees are the haves and taxpayers who foot the bills are the have-nots,” declared Scott Walker, the governor of Wisconsin.

For black Americans, government employment is a crucial means of upward mobility. The federal work force is 18.6 percent African-American, compared with 10.9 percent in the private sector. The percentages of African-Americans are highest in just those agencies that are most actively targeted for cuts by Republicans: the Department of Housing and Urban Development, 38.3 percent; the Equal Employment Opportunity Commission, 42.4 percent; and the Education Department, 36.6 percent.

The politics of austerity are inherently favorable to conservatives and inhospitable to liberals. Congressional trench warfare rewards those most willing to risk all. Republicans demonstrated this in last summer’s debt ceiling fight, deploying the threat of a default on Treasury obligations to force spending cuts.

Conservatives are more willing to inflict harm on adversaries and more readily see conflicts in zero-sum terms — the basic framework of the contemporary debate. Once austerity dominates the agenda, the only question is where the ax falls.