The battle over the nation’s health care law shifted from the courtroom to the ballot box Thursday, with President Obama praising the Supreme Court’s decision as a landmark that will help all Americans, and Mitt Romney, his presumed opponent, pledging to make repeal his first priority as president.

“The highest court in the land has now spoken. We will continue to implement this law. And we’ll work together to improve on it where we can,” Obama said in brief remarks at the White House.