President Obama waves after signing the Affordable Care Act at the White House on March 23, 2010. Chip Somodevilla/Getty Images hide caption

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Chief Justice John Roberts, shown in 2010, is still "finding his role as chief justice," says one law professor. Paul J. Richards/AFP/Getty Images hide caption

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California lawmakers have been introducing legislation that would replicate key pieces of the federal law, including bills defining benefits and guaranteeing coverage to people with pre-existing conditions. iStockphoto.com hide caption

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Faith-based groups that share health-care expenses struggle with the question of how much of the burden to share. Stan Rohrer/iStockphoto.com hide caption

itoggle caption Stan Rohrer/iStockphoto.com