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  1. Adjusted Interest Group Scores
    http://www.sscnet.ucla.edu/polisci/faculty/groseclose/Adj.Int.Group.Scores/

  2. Agency Data
    http://agencydata.wordpress.com/

  3. American Ideology Project
    http://americanideologyproject.com/

  4. American Legislatures Project
    http://americanlegislatures.com/

  5. American Politics Research
    http://apr.sagepub.com

  6. American Presidency Project
    http://www.presidency.ucsb.edu/index.php

  7. American Review of Politics
    http://www.uark.edu/ua/policy/arp/index.html

  8. Anthony Fowler
    http://voices.uchicago.edu/fowler/

  9. Barry C. Edwards
    http://www.poliscidata.com/replication/

  10. Biographical Directory of Members of Congress
    http://bioguide.congress.gov/biosearch/biosearch.asp

  11. Brendan Nyhan
    http://www.dartmouth.edu/~nyhan/

  12. Brookings Institution Vital Statistics on Congress
    https://www.brookings.edu/multi-chapter-report/vital-statistics-on-congress/

  13. Charles Stewart's Congressional Data Page
    http://web.mit.edu/17.251/www/data_page.html

  14. Christopher Olds
    http://www.christopherolds.com/

  15. Commonwealth: A Journal of Pennsylvania Politics & Policy
    https://tupjournals.temple.edu/index.php/commonwealth/index

  16. Congress & the Presidency
    http://www.tandfonline.com/toc/uctp20/current

  17. Congress Roll Call Vote Indexes (101-112)
    http://thomas.loc.gov/home/rollcallvotes.html

  18. Congressional Bills Project
    http://www.congressionalbills.org/

  19. Congressional Voting Data
    https://dataverse.harvard.edu/dataset.xhtml?persistentId=hdl:1902.1/10533

  20. Correlates of State Policy Project
    http://www.ippsr.msu.edu/public-policy/correlates-state-policy

  21. Cosponsorship Network Data
    http://jhfowler.ucsd.edu/cosponsorship.htm

  22. Dan Wood's Replication Data
    http://people.tamu.edu/~b-wood/replication.html

  23. Data Foundation
    http://www.datafoundation.org/

  24. Database on Ideology, Money in Politics, and Elections
    http://data.stanford.edu/dime/

  25. David Darmofal
    http://people.cas.sc.edu/darmofal/

  26. David Mayhew
    http://campuspress.yale.edu/davidmayhew/

  27. Digest of Educational Statistics
    https://nces.ed.gov/programs/digest/

  28. E. Scott Adler
    http://sites.google.com/a/colorado.edu/adler-scott/data

  29. Equality of Opportunity Project
    http://www.equality-of-opportunity.org/

  30. Executive Order Data
    http://www.archives.gov/federal-register/executive-orders/

  31. Forum
    http://www.degruyter.com/view/j/for

  32. GovTrack.us
    http://www.govtrack.us/

  33. Janet Box-Steffensmeier
    https://polisci.osu.edu/people/steffensmeier.2

  34. Josh Clinton's Replication Data
    http://my.vanderbilt.edu/joshclinton/data/

  35. Journal of Political Science
    https://www.coastal.edu/scpsa/journalofpoliticalscience/

  36. Justin Kirkland
    https://jhkirkla.wordpress.com/

  37. Kristin Kanthak
    http://www.pitt.edu/~kanthak/index.html

  38. Legislative Effectiveness Project (LEP)
    http://www.thelawmakers.org

  39. Marc Meredith
    http://www.sas.upenn.edu/~marcmere/

  40. Matt A. Barreto
    http://www.mattbarreto.com/

  41. Matthew Levendusky
    https://web.sas.upenn.edu/mleven/

  42. Maxwell Palmer
    http://dataverse.harvard.edu/dataverse/mpalmer

  43. National Conference of State Legislatures
    http://www.ncsl.org/

  44. New Nation Votes, A
    https://elections.lib.tufts.edu/

  45. North Carolina Center for Public Policy Research
    http://www.nccppr.org/drupal/

  46. Open States by the Sunlight Foundation
    http://openstates.org/

  47. Peter Enns
    http://thedata.harvard.edu/dvn/dv/Enns

  48. Policy Agendas Project
    http://www.policyagendas.org/

  49. Political Institutions and Public Choice Program Data
    http://sites.duke.edu/pipc/data/

  50. Presidency Research
    http://presdata.tamu.edu/

  51. Presidential Research Group Data Sites
    http://cstl-cla.semo.edu/renka/PRG/PRG_presidencydata.asp

  52. Princeton Gerrymandering Project
    http://gerrymander.princeton.edu/

  53. Religion Data Archives
    http://www.thearda.com/Archive/browse.asp

  54. Richard C. Fording
    https://rcfording.wordpress.com/

  55. Robert R. Preuhs
    http://rowdysites.msudenver.edu/~rpreuhs/

  56. State Policy Index
    http://www.statepolicyindex.com/

  57. State Politics & Policy Quarterly
    http://spa.sagepub.com/

  58. State Politics & Policy Quarterly Dataverse
    https://dataverse.unc.edu/dataverse/sppq

  59. StateMaster.com
    http://www.statemaster.com/index.php

  60. Steven Ansolabehere
    https://scholar.harvard.edu/sansolabehere

  61. Studies in American Political Development
    http://journals.cambridge.org/action/displayJournal?jid=SAP

  62. U.S. Census Bureau: Data Web
    http://www.thedataweb.org/

  63. United States Election Project
    http://www.electproject.org/home

  64. Vetoes by U.S. Presidents, 1789-present
    http://www.senate.gov/reference/Legislation/Vetoes/vetoCounts.htm

  65. Voteview (UCLA)
    https://voteview.com/

  66. Voteview Legacy Website
    http://voteview.org/