His backers feeling increasingly confident, Democrat Barack Obama made a slight nod to his Republican rival on Saturday and asked voters to have faith in him as the next president. Even as he criticized John McCain's economic policies, Obama acknowledged that the Republican nominee has asked his supporters to temper their attacks on him. "I appreciated his reminder that we can disagree while still being respectful of each other," Obama told thousands of supporters at the first of four outdoor rallies in Philadelphia. "Sen. McCain has served this country with honor," he said two hours later, in the city's Germantown neighborhood. "He deserves our thanks for that." At a town-hall event Friday in Minnesota, McCain took the microphone from a woman who said Obama is an Arab. McCain said, "No, ma'am," and he called Obama "a decent, family man."