WASHINGTON -- An Iraq war veteran expressed disappointment with President Bush on Saturday, saying the nation's leaders refuse to acknowledge the seriousness of continuing violence in Iraq. "I don't expect our leaders to be free of mistakes. I expect our leaders to own up to them," said Army National Guard 1st Lt. Paul Rieckhoff, who was a platoon leader in Iraq. Rieckhoff's comments, distributed by Sen. John Kerry's presidential campaign, were the Democratic response to the president's weekly radio address. Usually, a public official gives the response.