The Member Ideology data export contains biographical and ideological information about members of congress for the chamber(s) and congress(es) that were selected.
Quick Link (all congresses, all chambers, CSV format): https://voteview.com/static/data/out/members/HSall_members.csv
1+. The number of the congress that this member's row refers to. e.g.
115for the 115th Congress (2017-2019)
President. The chamber in which the member served.
1-99999. This is an ID code which identifies the member in question. In general, each member receives a single ICPSR identifier applicable to their entire career. A small number of members have received more than one: this can occur for members who have switched parties; as well as members who subsequently become president. Creating a new identifier allows a new NOMINATE estimate to be produced for separate appearances of a member in different roles.
0-99. Identifier for the state represented by the member.
0-99. Identifier for the district that the member represents within their state (e.g.
3for the Alabama 3rd Congressional District). Senate members are given
district_code0. Members who represent historical "at-large" districts are assigned
1in various circumstances.
1-9999. Identifying code for the member's party. Please see documentation for Party Data for more information about which
party_codeidentifiers refer to which parties.
1+. ICPSR occupancy code. This item is considered legacy or incomplete information and has not been verified. In general, members receive
0if they are the only occupant,
1if they are the first occupant,
2if they are the second occupant, etc.
1-5. ICPSR Attain-Office Code. This is an indicator that reflects the member's last means of attaining office. This item is considered legacy or incomplete information and has not been verified. Members received
1if they were elected in a general election,
2if elected by special election,
3if directly elected by a state legislature, and
1indicates NOMINATE was estimated conditionally for a given member.
0otherwise. Conditional estimation implies that an estimate is provisional and subject to updates when the next full estimation of NOMINATE scores occurs.
We present two main estimates of a legislator's ideology: NOMINATE and Nokken-Poole. NOMINATE estimates assume that members occupy a static ideological position across the course of their career. Nokken-Poole estimates assume that each congress is completely separate for the purposes of estimating a member's ideology. We expect that most users of our data will primarily make use of the
nominate_dim1 field, which reports the first dimension (often interpreted as economic liberalism-conservatism) of members as estimated by NOMINATE.
For more information on these scores, please see discussion in our journal article:
Boche, Adam, Jeffrey B. Lewis, Aaron Rudkin, and Luke Sonnet. "The new Voteview.com: preserving and continuing Keith Poole’s infrastructure for scholars, students and observers of Congress". Public Choice 176(1-2). Available online: https://link.springer.com/article/10.1007/s11127-018-0546-0
To cite this data, please use the following citation:
Lewis, Jeffrey B., Keith Poole, Howard Rosenthal, Adam Boche, Aaron Rudkin, and Luke Sonnet (2021). Voteview: Congressional Roll-Call Votes Database. https://voteview.com/