How interest groups behind healthcare legislation are financed is often unclear

Many of the Washington, DC, interest groups that are seeking to shape final healthcare legislation in the coming weeks operate with opaque financing, often receiving hidden support from insurers, drugmakers, or unions, the Washington Post reports. The groups, some newly formed and others reappearing with different sponsors, have spent months staging protests, organizing letter-writing campaigns and contributing to a record $200 million advertising blitz on healthcare reform, the Post reports.