“Dear Chicago Jesus, please use your divine intervention and save Obamacare from racist Supreme Court justice. Amen.”

WASHINGTON — The White House has begun an aggressive campaign to use approaching Supreme Court arguments on the newhealth care law as a moment to build support for the measure seen asPresident Obama’s signature legislative achievement, hoping to shape public opinion on an issue at the center of the battle for the White House and Congress.

On Wednesday, White House officials summoned dozens of leaders of nonprofit organizations that strongly back the health law to help them coordinate plans for a prayer vigil, press conferences and other events outside the court when justices hear arguments for three days beginning March 26.

At the White House meeting on Wednesday, a wide range of advocates representing consumers and people with diseases and disabilities — as well as doctors and nurses, labor unions and religious organizations — discussed plans to bolster the landmark law, which is being challenged by 26 states as unconstitutional.

Supporters of the law plan to hold events outside the court on each day of oral argument. The events include speeches by people with medical problems who have benefited or could benefit from the law. In addition, supporters will arrange for radio hosts to interview health care advocates at a “radio row,” at the United Methodist Building on Capitol Hill.

People who attended the meeting on Wednesday said the speakers included Jennifer Palmieri, deputy communications director at the White House; Jon Carson, director of the president’s Office of Public Engagement; Jeanne M. Lambrew, deputy assistant to the president for health policy; and Mark B. Childress, a deputy chief of staff at the White House.