Lois Lerner, the senior IRS official at the center of the decision to target tea party groups for burdensome tax scrutiny, signed paperwork granting tax-exempt status to the Barack H. Obama Foundation, a shady charity headed by the president’s half-brother that operated illegally for years. According to the organization’s filings, Lerner approved the foundation’s tax status within a month of filing, an unprecedented timeline that stands in stark contrast to conservative organizations that have been waiting for more than three years, in some cases, for approval. Lerner also appears to have broken with the norms of tax-exemption approval by granting...