President Barack Obama signs the healthcare legislation during a ceremony in the East Room of the White House in Washington, March 23, 2010. Credit: Reuters/Jason Reed

White House spokesman Robert Gibbs, speaking to reporters aboard Air Force as Obama traveled to Iowa to promote his healthcare overhaul, also said Republicans were pulling out all the stops to obstruct the law, but said they would fail.

(Reporting by Patricia Zengerle; Editing by Sandra Maler)