But challenged by committee chairman Dave Camp, a Republican from Michigan, to provide the number of people who had been able enroll for health insurance, Tavenner said the government did not have the figures.
So far, though, despite their best efforts, Obamacare has proved as "invincible" as the young people it needs to enroll.
Another episode features Jennifer Garner travelling to her home state of West Virginia to help enroll impoverished kids in early education programs.
For-profit colleges enroll only about 12% of America's college students, but they take in over a quarter of all federal financial aid, or around $33bn a year.
Most enroll in a teacher-certification course (some countries insist on this), meaning that university tutors are on tap, too.
On a call with reporters, Kathleen Sebelius, the health secretary, said she expected a surge of young people to enroll by April.
An extra 21.3m people would enroll in Medicaid by 2022.
He has also sent cadets to enroll in Pakistan's military academy in Abbottabad, in contrast to Mr Karzai's preference for training officers in India rather than in Pakistan.
In the 1960s a group of vulnerable pre-schoolers in Michigan were randomly selected either to enroll in a programme of daily coaching from well-trained teachers plus weekly home visits, or to join a control group.
Now Mr Duncan is offering four stringent options: replace the principal and at least half the staff; reopen the school under the management of a private group; close the school and enroll students elsewhere; or make sweeping changes such as extending the school day and giving principals more autonomy".The goals are terrific," says Randi Weingarten, leader of the American Federation of Teachers.
Students still have to pay, hence richer ones enroll more than poorer ones.
