Justices back health law, change the political landscape ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page David Goldman/Associated Press Steve Ciccarelli of Annandale, Va., right, a proponent of the law, argued with Susan Clark, of Washington, about the ruling. Charles Dharapak/Associated Press/File, 2010 Chief Justice John Roberts surprised court watchers by voting to uphold the health care law. Joshua Roberts/REUTERS Supporters celebrated after the Supreme Court upheld the law's constitutionality. Jonathan Ernst/REUTERS Presidential candidate Mitt Romney said the ruling showed that Republicans must defeat Barack Obama in November's election to overturn his health care overhaul. LUKE SHARRETT/AFP/GettyImages President Barack Obama hailed the court's decision as a victory for people across America and urged opponents to rally behind the law. Bill Greene/Globe Staff Massachusetts Governor Deval Patrick watched President Obama on television after the ruling. Dana Verkouteren/Associated Press An artist's rendering showed Chief Justice John Roberts, center, speaking as the Supreme Court upheld the Affordable Care Act in a 5-4 ruling. Jacquelyn Martin/Associated Press House Speaker John Boehner, an Ohio Republican, headed for the House chamber after the ruling. J. Scott Applewhite/Associated Press House Minority Leader Nancy Pelosi smiled as she watched news of the court's ruling. Nam Y. Huh/associated press People celebrated in Chicago after President Barack Obama's health care law was upheld by the Supreme Court Thursday. AP Senate Majority Leader Harry Reid, of Nevada, praised the justices for their decision. Kris Connor/Getty Images Susan Clark, left, argued with another protester outside the Supreme Court on Thursday. Jason Reed/REUTERS Protesters who opposed the act showed their dismay after the ruling was announced. Joshua Roberts/REUTERS A protester held up a sign in the wake of the ruling. Evan Vucci/Associated Press Demonstrators prayed outside the court after the ruling. Charles Rex Arbogast/Associated Press Chicago area senior citizens went to a local cooling center to escape the summer heat and watch President Barack Obama's reaction.