Several unions want the Labor Department to broadly authorize employer-sponsored "wraparound" coverage for workers to supplement their exchange plan benefits and subsidies, according to comments on a rule that is currently being reviewed by the White House. Under a little-noticed proposed rule the Labor Department issued on Dec. 24, the Obama administration proposed to treat as "excepted benefits" certain limited coverage provided by employers that would wrap around an individual market policy. If the wraparound coverage meets a number of...