That was enough for GOP Rep. Renee Ellmers of North Carolina to say: "The bottom line here is that CMS is responsible for this failure."
At the White House, spokesman Jay Carney told reporters on Thursday that administration officials "did not anticipate, we did not know of the kind of problems that would take place beginning on Oct. 1 until Oct. 1 came and we saw these challenges."
He repeated the president's insistence that the problems were being fixed, an assurance also provided by Bataille.
"We increased our bandwidth by adding servers and improving site architecture. We're continuing this work," she said. "Problems wtih our database and system synchronization also made it hard for visitors to initially create accounts. So we improved site architecture, substituted in hardware and optimized database inquiries."
Sebelius offered a similar view while addressing reporters in Arizona, acknowledging continued issues while insisting "fixes" are being instituted regularly to make things better.
"It's better today than it was on Oct. 1, but it's a long way from perfect," Sebelius said after visiting one of 17 call centers where some 10,000 representatives talk by phone or online with those asking about health plans. "And we are determined to make it perfect."
At the committee hearing, Campbell of CGI Federal said "the system is working, people are enrolling, but people will be able to enroll at a faster pace" as troubles get resolved.
Her company expects the online system to be able to enroll Americans seeking health insurance by Jan. 1, she added, rejecting media reports that software needs to be scrapped or that five million lines of code must be rewritten.
Campbell called the software program unprecedented, noting that "for the first time in history" it combines the process of enrolling and selecting health insurance with determining eligibility for government subsidies "all in one place."
To accentuate progress on the website, two Democratic panel members said during the hearing that either they or their offices were able to use the website to determine health insurance options available to them on Wednesday or Thursday.
However, Republicans said they had failed to gain full access to the website despite repeated attempts and complained they hear similar stories from their constituents across the country.
The Energy and Commerce Committee isn't the only one probing Obamacare in light of its issues. So, too, is the House Ways and Means Committee and the House Oversight and Government Reform Committee.
The latter sent an eight-page letter Wednesday to 11 contracting firms involved in putting together HealthCare.gov giving them two days to provide documents, meeting lists and all communications with the Obama administration on the project, committee spokeswoman Caitlin Carroll said.
Meanwhile, Republican Sens. Orrin Hatch of Utah and Chuck Grassley of Iowa sent a letter to 47 contractors on Thursday also seeking extensive details of their work on the Obamacare website including all contracts and other information.
Congressional Republicans have sought to undermine the health care reforms, trying unsuccessfully to make defunding or delaying them a requirement for legislation to fund the government.
The White House has pushed back against Republicans and some Democrats who have urged an extension of the open enrollment period beyond March 31 and/or a delay in penalties for those who don't sign up for insurance on time because of the website issues.
The Obama administration is moving to clarify confusion on when people need to sign up for health care, and it has plans to issue new guidelines to this point soon.
Still, Health and Human Services spokeswoman Joanne Peters insisted "the individual mandate timing" -- i.e. the requirement for a person to have insurance by March -- "has not changed. ... It was true this morning. It is true tonight."