With his decision to give up public financing and the spending limits that go with it, Mr. Obama has added several seasoned hands to his advertising team, a harbinger of a multifaceted television campaign that people inside and outside Obama headquarters said would grow well beyond its already large presence in 18 states.

Future commercials could run on big national showcases like the Olympics in August and smaller cable networks like MTV and Black Entertainment Television that appeal to specific demographic and interest groups.

Mr. Obama is also dispatching paid staff members to all 50 states, an unusual move by the standards of modern presidential campaigns so often fought in just a contained group of contested territories.

His aides and advisers said they did not believe Obama necessarily has a serious chance of winning in many of the traditionally Republican states, but rather that he can at least draw Mr. McCain into spending time and money there while also swelling the rolls of Democratic voters and supporting other Democrats on the ballot.

His strategists are busily studying data from focus groups, magazine subscription lists and census studies. It is the beginning of an intensive door-to-door drive, using volunteers overseen by a growing staff of organizers, to reach voters using persuasive messages tailored to their individual interests through the mail, e-mail and word of mouth.

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