It has become an exercise in free speech and a challenge to the federal government. "Pulpit Freedom Sunday," the birth child of the group Alliance Defending Freedom, is designed to challenge the 50-year-old Johnson Amendment (501 c 3), which prohibits tax-exempt charities from publicly endorsing or opposing a candidate for office or working on their behalf. On Sunday, October 7, pastors who choose to participate will stand in the pulpit and endorse and/or oppose candidates for office—and no doubt focus on the presidential candidates themselves.