A suggested lesson plan that calls on school kids to write letters to themselves about what they can do to help President Obama is troubling some education experts, who say it establishes the president as a "superintendent in chief" and may indoctrinate children to support him politically.

But the White House says the speech is merely "designed to encourage kids to stay in school."

Obama will deliver a national address directly to students on Tuesday, which will be the first day of classes for many children across the country. The address, to be broadcast live on the White House's Web site, was announced in a letter to school principals last week by Education Secretary Arne Duncan...