Democratic nominee for mayor of D.C., Muriel Bowser, spent Tuesday morning at the marriott Marquis Hotel downtown joining housekeeper Juanita King on her daily tasks. Her housekeeper-for-a-day stint was organized by Unite Here Local 25, a local union representing members of the hospitality industry in Washington. When Bowser won the union’s endorsement last month, political director Sam Epps said, some of its members invited her to get a firsthand look at their jobs. Inviting a potential mayor to change sheets and spray toilets shows “how tedious and hard cleaning rooms is,” Epps said. But it can be rewarding. As a new hire, King makes $13.53 an hour; by next April, Epps said, she will make $18.80 an hour under the union’s contract, which also includes fully paid health benefits and a retirement plan.“We want elected officials to understand what union jobs can do for people in their lives,” Epps said. “We’re creating middle-class jobs here.”