It may have been a formality, but the executive board of the Service Employees International Union this past Saturday overwhelmingly named SEIU Executive Vice President Mary Kay Henry to succeed Andrew Stern as the labor organization's next president. The 73-member governing body met in Washington, D.C. to select Ms. Henry, who ran unopposed after Secretary-Treasurer Anna Burger dropped out of the race a little over a week earlier. Henry, like Burger, is a Stern loyalist.