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With a host of political battles ready to resume after the holiday weekend, President Obama's used his July 4th radio address to focus on the White House's domestic agenda. Saying that an "unyielding spirit is what defines us as Americans," Obama called on Americans to to tackle health care reform, kick foreign oil, improve the school system, and fix the economy."That is the spirit we are called to show once more," Obama said Saturday. "We are facing an array of challenges on a scale unseen in our time." Obama's former presidential opponent, Senator John McCain, also recorded a July 4th address, focused on Iran. "Today, we stand with the millions of Iranians who brave batons, imprisonment and gunfire to have their voices heard and their votes counted," McCain said.