Pastor Rick Warren appears on the cover of the Aug. 18 issue of TIME magazine. An article by David Van Biema, "The Purpose Driven Pastor," profiles Warren, best-selling author, founding pastor of Saddleback Church and host of an Aug. 16 forum with the two presumptive presidential nominees.

John McCain and Barack Obama write about their own views of faith in the issue, and a TIME poll shows that 70% of white evangelical voters support McCain.