The decline in the uninsured was modest compared to a bigger drop in 2011, which occurred due to increased coverage for young adults under the new health care law.
Because the main provisions of the Affordable Care Act don't take effect until 2014, the latest census numbers offer a baseline number of uninsured by which increased coverage and effectiveness of the law will be measured. Many conservative Republicans remain committed to repealing the law.
Starting next year, the government will offer tax credits for people without access to job-based health insurance to buy private coverage through new markets, called exchanges, in each state. Open enrollment starts Oct 1. The new health care law also expands Medicaid to cover millions more low-income people, but so far only 24 states plus Washington, D.C., have gone along with the expansion.