"Medicare Advantage has been a tremendous success," the Texas Republican said.
Republicans assailed Obama for repeatedly breaking promises to lower healthcare costs.
The administration hoped to enroll 7M people in private plans during the reform's first year.
The criticism represents a major blow to the overhaul initiative.
HHS said the bulk of determinations came in states that opted to expand their programs.
Group said the campaign would inform voters about where candidates stand on women’s issues.
In 1993 speech to Democratic lawmakers she said it would be a "harder sell" than her plan.
Officials admit they are “really tired of talking about” it.
Leaders are bringing up legislation to eliminate the 2014 penalty for not having insurance.
More tax credits will be offered in states with failed exchanges.