CORRECTING THE NARRATIVE: Yes Obama, Republicans have offered Obamacare alternatives.

Related: Byron York: Who was standing behind Obama today? White House won’t say.

Nineteen people stood behind President Obama on stage in the Executive Office Building Tuesday as the president kicked off a new campaign to promote Obamacare. One of those people, a young Florida woman named Monica Weeks, introduced Obama after telling the story of being struck with Crohn’s disease at age 19 and receiving expensive treatments for several years covered by her parents’ health care plan — because Obamacare allowed her to remain on that plan until age 26. Now, Weeks said, she has coverage through a job. “The Affordable Care Act gives young adults who are just starting their careers more time to find a good job that offers reliable health insurance,” Weeks said.

There were 18 other people standing with Weeks and the president on stage. Obama began his remarks by saying, “Thanks to Monica, thanks to everybody standing behind me.” A little later, criticizing Republicans who have pronounced Obamacare a failure, the president said, “I would advise them to check with the people who are here today and the people that they represent all across the country whose lives have been changed for the better by the Affordable Care Act.”

But Obama never said who those people were, and, unlike other events, the White House did not release their names or biographies. A spokesman later said the White House would not provide the information. A pool report called the group “19 individuals whom the White House said benefited from health care reform.” Beyond that, their connection to Obamacare remains unknown.

Actors? Temps? Relatives of White House staffers? Who knows?