WASHINGTON -- The bundling of political donations once was an innocuous play in the game book of Washington political operatives. Now, the fund-raising practice has grown so widespread, and some of its practitioners so brazen, that bundling has become the chief source of abuse in the American campaign-finance system. The strange case of Norman Hsu, the textile-importer-turned-fugitive who cobbled together $800,000 in contributions for Sen. Hillary Rodham Clinton's presidential campaign, is the tip of the iceberg. Candidates for offices from county commissioner to U.S. president are increasingly turning to bundlers -- individuals who ask friends, family and business associates for...