In dueling holiday addresses, President Barack Obama appealed for public support of his domestic programs and Sen. John McCain said Americans should side with Iranian election protesters. The 2008 rivals for the White House both cited the spirit of the nation's founders in their Fourth of July radio and Internet broadcasts on Saturday. Obama said an "unyielding spirit is what defines us as Americans" and led people during the nation's history to explore the West, persevere during the Depression and build a robust industrial economy. "That is the spirit we are called to show once more," Obama said. "We are facing an array of challenges on a scale unseen in our time. We are waging two wars. We are battling a deep recession. And our economy...