WASHINGTON (AP) — Darfur activists upset about President Barack Obama’s Sudan policy are launching a critical advertising campaign that urges him to step up pressure on Khartoum. The move comes as the Obama administration is preparing to release a delayed review of U.S. policy on Sudan. Activists, who had hoped Obama would focus more than the Bush administration did on Darfur and take a tougher line, say they fear disappointment.- – – – Contact The Daily Reveille’s news staff at [email protected]