A biography of the former Alaska governor is set for release in September by Christian book publisher Zondervan. “Speaking Up: The Sarah Palin Story,” is one in a series of biographies aimed at 9- to 12-year-old readers. Others feature 2007 Heisman Trophy winner Tim Tebow and U2 frontman Bono. Pam Mettler, a spokeswoman for the Zondervan's ZonderKidz division, says the subjects are “active Christians in the world” and prominent news figures. She says the Grand Rapids, Michigan-based publisher believes kids will connect with their stories. Palin, the 2008 Republican vice presidential nominee, has often referred to her faith and what she sees as her calling to public service.