The insurance marketplaces that form a pillar of the Affordable Care Act are now officially live ... kind of. As uninsured Americans nationwide logged on to Healthcare.gov Tuesday morning, many were asked to keep waiting.

Nurse Allison Miller checks the blood pressure of a patient in Los Angeles. Days before the Affordable Care Act's insurance marketplaces open, a new study has found that confusion among Californians remains widespread. Photo by David McNew/Getty Images. SAN…

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