13 attorneys general, including Utah's Shurtleff, sue over health care overhaul

Under the bill, starting in six months, health insurance companies would be required to keep young adults as beneficiaries on their parents' plans until they turn 26, and companies would no longer be allowed to deny coverage to sick children.

Other changes would not kick in until 2014.

That's when most Americans will for the first time be required to carry health insurance — either through an employer or government program or by buying it themselves. Those who refuse will face tax penalties.

"This is the first time in American history where American citizens will be forced to buy a particular good or service," said Nebraska Attorney General Jon Bruning, who is also president of the National Association of Attorneys General, explaining why his state joined the lawsuit.

Tax credits to help pay for premiums also will start flowing to middle-class working families with incomes up to $88,000 a year, and Medicaid will be expanded to cover more low-income people.

No Republicans in the U.S. House or Senate voted for the bill.

Associated Press Writer Meg Kinnard in Columbia, S.C., David Runk in Detroit and Josh Funk in Omaha, Neb., contributed to this report.