“We deserve more than tolerance from one another, we deserve each other’s respect, whether we think each other right or wrong in our views,” Mr. McCain said in a speech delivered in Prescott, Ariz. He added: “Let us remember, we are not enemies. We are compatriots defending ourselves from a real enemy. We have nothing to fear from each other.”

On the air, Ed Schultz, a liberal talk show host based in Fargo, N.D., is well-known for his blunt criticisms of the Bush Administration and the Republican Party. But Mr. Schultz, a fervent supporter of Senator Barack Obama, may have gone too far late Friday when he called Senator John McCain “a warmonger.”

Mr. Schultz, whose program is syndicated nationally, made the remarks while revving up a group of Obama supporters at a $100-a-head fund raiser at the North Dakota Democratic Party’s convention in Grand Forks. As soon as the Republican National Committee got word of the attack, it issued a statement lambasting Mr. Schultz and calling on Mr. Obama to repudiate the characterization of the presumptive Republican nominee for President.

“Enough is enough,” said Robert M. Duncan, the chairman of the Republican National Committee. “Senator Obama has an obligation to speak out and publicly reject and denounce — not applaud — the shameful and contemptible remarks made by his surrogates.”