The city closed the failing Dodge Elementary School, for example, in 2002 and reopened it as an academy where candidates for advanced degrees in education work in classrooms under master teachers while studying at a local university. Mr. Obama visited the school in 2005, liked what he saw and now proposes to create 200 such teacher residency programs nationwide. The goal, he says, would be to turn out 30,000 teachers a year to work in the toughest schools.

Mr. Obama’s views have drawn heavily from a cast of experts who helped mold the Chicago experience. Strategies for overhauling failing schools have come from Arne Duncan, who as chief executive of the Chicago public schools led the turnaround efforts. The senator derived his views on early childhood education in part from the work of a Nobel Prize-winning economist based in Chicago.

The scope of Mr. Obama’s plan has impressed many educators, but not everyone.

Michael J. Petrilli, a former Education Department official under Mr. Bush, said Mr. Obama’s plan was more comprehensive than Mr. McCain’s.

“That’s because Obama is proposing what somebody called a Christmas tree of new programs,” Mr. Petrilli said. “McCain is suggesting a couple of new things, but doesn’t think Washington should spend more on education than we already are.”

Mr. Obama’s interest in education extends back to his work as a community organizer here in the mid-1980s. In his memoir, “Dreams From My Father,” he describes a school system plagued by textbook shortages and teacher strikes. He carried those experiences with him to Harvard Law School, where he took courses on school issues taught by Christopher Edley Jr.

“Barack became committed to the notion that progress in school reform can’t come through volunteerism and professional aspiration alone,” said Mr. Edley, now dean of the law school at the University of California, Berkeley. “It has to be undergirded with a legal and regulatory structure that rewards success and goes after failure.”

Mr. Obama immersed himself in education issues after his return to Chicago, where he began lecturing at the University of Chicago Law School and joined the boards of two education foundations.