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David Goldman/Associated PressSteve Ciccarelli of Annandale, Va., right, a proponent of the law, argued with Susan Clark, of Washington, about the ruling.
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Charles Dharapak/Associated Press/File, 2010Chief Justice John Roberts surprised court watchers by voting to uphold the health care law.
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Joshua Roberts/REUTERSSupporters celebrated after the Supreme Court upheld the law's constitutionality.
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Jonathan Ernst/REUTERSPresidential candidate Mitt Romney said the ruling showed that Republicans must defeat Barack Obama in November's election to overturn his health care overhaul.
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LUKE SHARRETT/AFP/GettyImagesPresident Barack Obama hailed the court's decision as a victory for people across America and urged opponents to rally behind the law.
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Bill Greene/Globe StaffMassachusetts Governor Deval Patrick watched President Obama on television after the ruling.
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Dana Verkouteren/Associated PressAn artist's rendering showed Chief Justice John Roberts, center, speaking as the Supreme Court upheld the Affordable Care Act in a 5-4 ruling.
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Jacquelyn Martin/Associated PressHouse Speaker John Boehner, an Ohio Republican, headed for the House chamber after the ruling.
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J. Scott Applewhite/Associated PressHouse Minority Leader Nancy Pelosi smiled as she watched news of the court's ruling.
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Nam Y. Huh/associated pressPeople celebrated in Chicago after President Barack Obama's health care law was upheld by the Supreme Court Thursday.
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APSenate Majority Leader Harry Reid, of Nevada, praised the justices for their decision.
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Kris Connor/Getty ImagesSusan Clark, left, argued with another protester outside the Supreme Court on Thursday.
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Jason Reed/REUTERSProtesters who opposed the act showed their dismay after the ruling was announced.
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Joshua Roberts/REUTERSA protester held up a sign in the wake of the ruling.
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Evan Vucci/Associated PressDemonstrators prayed outside the court after the ruling.
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Charles Rex Arbogast/Associated PressChicago area senior citizens went to a local cooling center to escape the summer heat and watch President Barack Obama's reaction.