Democratic presidential candidate Barack Obama hopes the words of the women in his life will resonate with Pennsylvania voters as the state gears up for its primary on April 22.

A 30-second advertisement released by the campaign this week features Obama's sister, Maya Soetoro-Ng, and his maternal grandmother, Madelyn Dunham, both Hawai'i residents.

Soetoro-Ng, a history teacher at La Pietra — Hawaii School for Girls, has been an outspoken supporter of her brother, but the appearance is a first for Dunham, who has declined media interviews and generally stayed out of the campaign spotlight.

"Well, I think it's given him a lot of depth and a broadness of view," Dunham says, as a photograph appears of a young Obama with his grandparents when he was an undergraduate student at Columbia University.

Michelle Obama also speaks in the advertisement over images of the couple with their two young daughters.

"Barack and I talk all the time about making sure that our girls can imagine any kind of world for themselves, with no barriers," she says.

Soetoro-Ng follows: "He wants to make sure that everybody's children have the opportunities that his daughters have."