Washington, DC -- The Web site of the Democratic National Committee links Internet users to the sites of 279 political and advocacy organizations, labor unions, religious groups and government agencies. The list, divided into 28 categories, includes everything from the Willie Valasquez Institute to the Oneida Indian Nation to the National Association of Social Workers. But the DNC is resisting adding a 280th link. For almost a year, an organization dedicated to electing Democrats to national, state and local offices has been pressing the national party to add its Web site to the DNC's list of linkable sites. The problem...