(NBC NEWS) One of the most liberal members of the U.S. Senate laid into the executive heading the Obama administration’s health insurance website Tuesday, saying she feared people had lost confidence in the whole effort.

Republicans have been on the attack for weeks, holding hearings to highlight the glitches that have made the site unworkable for most people and embarrassed the administration. Maryland Senator Barbara Mikulski, a strong supporter of health reform and of the administration, said she was reluctantly weighing in, too.

“I believe there has been a crisis of confidence created in the dysfunctional nature of the website, cancellation of policies and sticker shock for some people,” Mikulski said at a hearing held by the Senate’s Democratic-led Health, Education, Labor and Pensions committee.

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