WASHINGTON - The AFL-CIO is enduring a budget shortfall so severe that its own workers are taking two days of unpaid leave to avoid layoffs, even as the labor federation attempts to mobilize its largest-ever political campaign. Dubbed "solidarity days," the days off were agreed to this past summer in contract negotiations between managers and the union representing about 200 workers at the AFL-CIO, an umbrella organization of 64 international unions. Managers also have agreed to take the unpaid time. AFL-CIO spokeswoman Lane Windham said employees covered by the Newspaper Guild Local 32035 decided they would rather lose pay for...