It was fun and games at the Minnesota Children's Museum today as "Sesame Street" characters Rosita and Maria entertained a group of children from Hennepin County Head Start. But interspersed between the songs and dances was a very serious message about lead poisoning. More than 4,000 Minnesota children have elevated levels of lead in their blood. At least 439 of those kids have levels so high they're at risk of brain damage and even death. The "Sesame Street" tour is the first "all-out" lead awareness campaign in the state. But as Minnesota Public Radio's Lorna Benson reports, for years a Minneapolis neighborhood has waged it's own quiet war against lead.