President Obama’s fruitless three-year search for compromise with the Republicans ended in a thunderclap of a speech on Tuesday, as he denounced the party and its presidential candidates for cruelty and extremism. He accused his opponents of imposing on the country a “radical vision” that “is antithetical to our entire history as a land of opportunity.” 

Mitt Romney, the Republican presidential front-runner, has embraced a House budget plan that is little more than “thinly veiled social Darwinism,” the president said, a “Trojan horse” disguised as deficit reduction that would hurt middle- and lower-income Americans.  

The speech was immediately attacked by the House speaker, John Boehner, for failing to deal with the debt crisis, but Mr. Obama pointed out how hollow that charge has become. “That argument might have a shred of credibility were it not for their proposal to also spend $4.6 trillion over the next decade on lower tax rates,” he said. The math is, in fact, quite simple: cutting both taxes and the deficit can mean only more sacrifice from the middle class and the poor, ending the promise of Medicare and Medicaid.