“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,...