On Friday, Rep. John D. Dingell, D-Mich., will become the longest-serving member of Congress. His career has survived because of a strong Democratic district and his financial support from PACs of organized interests such as those in the areas of labor, energy/natural resources, communications/technology and health care. His south Detroit district is made up of a mix of academics, engineers and auto workers.

From 1979 to the present he has received over $2.5 million from PACs of health care interests, with the most coming during consideration of health care legislation from 2001 to 2010. In 2007-2008 he received more than $550,000 from PACs with health care interests.

Organized labor PACs contributed $2.1 million from 1979 to present. Energy/natural resources PACs gave almost $2.1 million from 1979 to the present. Communication/technology PACs gave more than $1.8 million.

View Rep. Dingell’s career chart of PACs by industry category on his financial profile, under the “Career” tab.