PORTLAND, Ore. — Senior staffers of U.S. Rep. David Wu were so alarmed over the Oregon Democrat's erratic behavior just days before the November election that they demanded he enter a hospital for psychiatric treatment, a newspaper reported Friday evening. The Oregonian, citing interviews with a number of anonymous staff members, reported on its website that Wu was increasingly unpredictable on the campaign trial and in private last fall, and had several angry and loud outbursts and sometimes said "kooky" things to staff around potential voters and donors. The Willamette Week newspaper carried a similar report Friday on its website.