Each of Clinton's new ads is tailored to a specific media market, with two of the commercials featuring Gov. Rendell and Mayor Nutter.

Obama's commercials are targeted in a different sense, with two addressing specific issues and a third seemingly aimed at women. It fleshes out the man by having his wife, grandmother and half-sister talk about his values.

Officials of the two campaigns would not discuss the size of their television buys.

Industry sources indicated that the Clinton campaign would be spending roughly $1 million in the coming week and Obama nearly $2.5 million. The ratio by which he is outspending her is slightly lower than it has been in the last two weeks.

Rendell and Nutter star in Clinton campaign commercials slated for the Philadelphia region.

In the Rendell ad, the governor looks into the camera and says: "I've known Hillary for 15 years. She's spent her life standing up for people. When she believes something has to be done, she just won't quit."

The commercial featuring Nutter plays off the expectation that the mayor, as an African American, might be expected to support Obama.

"I know. You want to know why I'm supporting Hillary," Nutter says. "She gets it, and she gets the job done."

A third ad was done for Spanish-language stations in Philadelphia, with an announcer saying that Clinton "respects our culture and understands the problems that affect our community."

There is also an ad for Scranton/Wilkes-Barre in which the candidate notes that her father grew up in Scranton. For everywhere else in the state, Clinton has a spot bemoaning what she calls President Bush's "trapdoor" economy.

Three of Obama's new ads consist of excerpts from his campaign speeches and meetings with supporters.

In one, he talks about telling automobile executives of the need to raise fuel-efficiency standards. In another, he discusses health-care reform, referring to his late mother's unpleasant experience with the current system.

In a third, which includes video from his rally at Pennsylvania State University on March 30, he talks about how one voice can change the world.

His most striking new ad is the one featuring his half-sister, Maya Soetoro-Ng; his rarely seen grandmother, Madelyn Dunham; and his wife, Michelle.

"People recognize themselves in Barack and they feel understood by him," Soetoro-Ng says in the ad. "In part that's because he listens so well."

The ad appears to be an attempt both to humanize Obama and to show the racial and ethnic diversity within his own family.

Candidates' Pa. Schedules

Sen. Barack Obama is scheduled to appear

at town-hall meetings today at Great Valley High School, Malvern,

at 11:30 a.m. and at Truman High school, Levittown, at 5 p.m. Tickets were

distributed yesterday.

Sen. Hillary Rodham Clinton is to appear

this morning at a

forum in Aliquippa, in Western Pennsylvania.

More political coverage online at http:// go.philly.com/paprimary