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Vol:.(1234567890)
Interest Groups & Advocacy (2020) 9:342–360
https://doi.org/10.1057/s41309-020-00085-x
ORIGINAL ARTICLE
Large‑N bill positions data fromMapLight.org: What can we
learn frominterest groups’ publicly observable legislative
positions?
GeoreyM.Lorenz1 · AlexanderC.Furnas2· JesseM.Crosson3
Published online: 22 April 2020
© Springer Nature Limited 2020
Abstract
The transparency organization MapLight records instances of organizations tak-
ing positions for and against legislation in Congress. The dataset comprises some
130,000 such positions taken on thousands of bills between the 109th and 115th
Congresses (2005–2018). The depth and breadth of these data potentially give them
wide applicability for answering questions about interest group behavior and influ-
ence as well as legislative politics more broadly. However, the coverage and content
of the data are affected by aspects of MapLight’s research process. This article intro-
duces the MapLight dataset and its potential uses, examines issues related to sam-
pling and other aspects of MapLight’s research process, and explains how scholars
can address these to make appropriate use of the data.
Keywords MapLight· Interest groups· Legislative politics· Political economy·
Lobbying· Bill positions· Congress
Interest groups routinely lobby for and against legislation in the U.S. Congress.
These efforts may influence a bill’s content as well as its likelihood of advancing
through the legislative process and into law. For decades, scholarship on inter-
est groups has been hampered by the difficulty of assessing groups’ positions on
* Geoffrey M. Lorenz
gmlorenz@unl.edu
Alexander C. Furnas
zfurnas@umich.edu
Jesse M. Crosson
jcrosson9@gmail.com
1 Department ofPolitical Science, University ofNebraska-Lincoln, Lincoln, USA
2 Department ofPolitical Science, University ofMichigan, AnnArbor, USA
3 Trinity University andFaculty Fellow, Center fortheStudy ofDemocratic Politics, Princeton
University, Princeton, USA
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