The Internal Revenue Service has warned one of Southern California’s largest churches it could lose its tax-exempt status because a priest gave a sermon criticizing the Iraq war two days before last year’s presidential election. The IRS has sent the All Saints Episcopal Church in Pasadena a warning that the federal tax code prohibits tax-exempt organizations, including churches, from intervening in political campaigns and elections. The IRS has issued warnings to other non-profits, including the NAACP, for issuing statements deemed critical of the president.