A broadly smiling President Barack Obama on Tuesday signed a historic $938 billion health care overhaul that guarantees coverage for 32 million uninsured Americans and will touch nearly every citizen's life, presiding over the biggest shift in U.S. domestic policy since the 1960s and capping a divisive, yearlong debate that could define the November elections.

Celebrating "a new season in America" - the biggest accomplishment of his White House and one denied to a line of presidents before him - Obama made the massive bill law with an East Room signing ceremony. He was joined by jubilant House and Senate Democrats as well as lesser-known people whose health care struggles have touched the president.

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