Abstract
In the context of increasing automation of Australian electoral processes, and accusations of deliberate interference in elections in Europe and the USA, it is worthwhile understanding how little a change in the recorded ballots could change an election result. In this paper we construct manipulations of the ballots in order to change the overall balance of power in an Australian Federal Senate election – the upper house of Parliament. This gives, hopefully tight, over-estimations of the Margin of Victory (MOV) for the party or coalition winning the Senate. This is critical information for determining how well we can trust the reported results, and how much auditing should be applied to the election process to be certain that it reports the true result. The challenge arising in Australian Federal Senate elections is that they use a complicated Single Transferable Vote (STV) method for which it is intractable to compute the true MOV, hence we must rely on greedy methods to find small manipulations.
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Notes
- 1.
Where \(\delta ^m_i > \varDelta _{i,j}\), we reset \(\delta ^m_i\) to \(\lceil \varDelta _{i,j} / \gamma \rceil \).
References
Blom, M., Conway, A., Stuckey, P.J., Teague, V.J.: Did that lost ballot box cost me a seat? Computing manipulations of STV elections. In: IAAI (2020)
Blom, M., Stuckey, P.J., Teague, V.J.: Computing the margin of victory in preferential parliamentary elections. In: Krimmer, R., Volkamer, M., Cortier, V., Goré, R., Hapsara, M., Serdült, U., Duenas-Cid, D. (eds.) E-Vote-ID 2018. LNCS, vol. 11143, pp. 1–16. Springer, Cham (2018). https://doi.org/10.1007/978-3-030-00419-4_1
Blom, M., Stuckey, P.J., Teague, V.: Towards computing the margin of victory in STV elections. Inf. J. Comput. 31(4), 636–653 (2019)
Conway, A.: Australian federal senate simulator. https://github.com/SiliconEconometrics/PublicService (2019). Accessed Aug 2019
Miragliotta, N.L.: Little differences, big effects: An example of the importance of choice of method for transferring surplus votes in PR-STV voting systems. Representation 41, 15–24 (2004)
Australian federal senate election rules (2019). www.austlii.edu.au/au/legis/cth/consol_act/cea1918233/s273.html. Accessed Aug 2019
Weeks, L.: Tolerable chance or undesirable arbitrariness? Distributing surplus votes under PR-STV. Parliamentary Aff. 64, 530–551 (2011)
Xia, L.: Computing the margin of victory for various voting rules. In: Proceedings of the 13th ACM Conference on Electronic Commerce, EC 2012, pp. 982–999. ACM, New York (2012)
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Blom, M., Conway, A., Stuckey, P.J., Teague, V.J. (2020). Shifting the Balance-of-Power in STV Elections. In: Krimmer, R., et al. Electronic Voting. E-Vote-ID 2020. Lecture Notes in Computer Science(), vol 12455. Springer, Cham. https://doi.org/10.1007/978-3-030-60347-2_1
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DOI: https://doi.org/10.1007/978-3-030-60347-2_1
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