Later this fall, President Obama will sign into law a landmark health-reform bill. Then the hard part begins. Barack Obama was advised early in his presidency to focus on just one thing at a time and postpone health care for another year. The advice was pressed on him not just from outside observers but from trusted aides inside the White House. He rejected it—and for that reason, among others, the health reform that's been delayed for a century, and which he will sign into law this fall, will carry his indelible stamp. Afterward, though, there will be no period of...