WASHINGTON - The Obama administration will ask Congress to improve childhood nutrition by ridding school vending machines of sugary snacks and drinks and giving school lunch and breakfast to more kids. Agriculture Secretary Tom Vilsack said the administration will seek changes when Congress overhauls the Childhood Nutrition Act. "Our children deserve better nutrition, and our country's better and brighter future depends on it," Vilsack said. "And with the reauthorization of the Childhood Nutrition Act scheduled this year, there won't be a better time than now to act boldly."