A 2017 study in the American Journal of Political Science found that for 12 countries (Austria, Bulgaria, Canada, Germany, Ireland, Italy, the Netherlands, Portugal, Spain, Sweden, the United Kingdom, and the United States) found that political parties fulfill their promises to voters to a considerable extent:3
Parties that hold executive office after elections generally fulfill substantial percentages, sometimes very high percentages, of their election pledges, whereas parties that do not hold executive office generally find that lower percentages of their pledges are fulfilled. The fulfillment of pledges by governing executive parties varies across governments in ways that reflect power-sharing arrangements. The main power-sharing arrangement that impacts pledge fulfillment distinguishes between single-party governments and coalitions, not between governments with and without legislative majorities. We found the highest percentages of pledge fulfillment for governing parties in the United Kingdom, Sweden, Portugal, Spain, and Canada, most of which governed in single-party executives. We found lower percentages for governing parties in Germany, the Netherlands, Austria, Bulgaria, Ireland, and Italy, most of which governed in coalitions. Pledge fulfillment by U.S. presidential parties lies at the higher end of coalition governments, which suggests that U.S. presidents are more constrained than governing parties in single-party parliamentary systems, but less constrained than most governing parties in multiparty coalitions.[excessive quote]
Other research on the United States suggests that Democratic and Republican congresspeople voted in line with their respective party platforms 74% and 89% of the time, respectively.4
Thomson, Robert; Royed, Terry; Naurin, Elin; Artés, Joaquín; Costello, Rory; Ennser-Jedenastik, Laurenz; Ferguson, Mark; Kostadinova, Petia; Moury, Catherine (2017-07-01). "The Fulfillment of Parties' Election Pledges: A Comparative Study on the Impact of Power Sharing" (PDF). American Journal of Political Science. 61 (3): 527–542. doi:10.1111/ajps.12313. ISSN 1540-5907. https://strathprints.strath.ac.uk/59403/1/Thomson_etal_AJPS_2016_The_fulfillment_of_parties_election_pledges.pdf ↩
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Rebecca Leung (January 9, 2004). "Bush Sought 'Way' To Invade Iraq?, O'Neill Tells '60 Minutes' Iraq Was 'Topic A' 8 Months Before 9-11". CBS News. Archived from the original on January 13, 2004. https://web.archive.org/web/20040113035155/http://www.cbsnews.com/stories/2004/01/09/60minutes/main592330.shtml ↩
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Kevin Liptak (February 23, 2016). "Obama gives Congress Guantanamo closure plan". CNN. http://www.cnn.com/2016/02/23/politics/guantanamo-bay-obama-prison-closure-plan/ ↩
"Tuition fees: How Liberal Democrat MPs voted". BBC News. 2010-12-09. Retrieved 2025-01-25. https://www.bbc.co.uk/news/uk-politics-11964669 ↩
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ITV (6 September 2021). "'Absolutely nobody' will challenge National Insurance hike to pay for social care, says minister". ITV News. Retrieved 17 September 2021. https://www.itv.com/news/2021-09-05/social-care-funding-talks-ongoing-as-tory-grandees-blast-national-insurance-hike ↩
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