Miami-With just weeks left to sign up for health care under the Affordable Care Act, Michelle Obama zeroed in on recruiting the crucial young adult demographic during a visit to a Miami community health center Wednesday. The first lady congratulated a handful of residents who had just enrolled during an intimate event, asking one woman whether she had gotten her son to enroll. “Tell him he could get hit by a car. It’s crazy. They don’t think about that kind of stuff,” said Obama, who moments later applauded another mother for signing herself and adult son up for insurance plans....