<P> The presence of spoilers often gives rise to suspicions that manipulation of the slate has taken place . A spoiler may have received incentives to run . A spoiler may also drop out at the last moment, inducing charges that such an act was intended from the beginning . </P> <P> Under first - past - the - post, a small party may draw votes away from a larger party that it is most similar to, and therefore give an advantage to another less similar large party . </P> <P> First - past - the - post within geographical areas tends to deliver (particularly to larger parties) a significant number of safe seats, where a representative is sheltered from any but the most dramatic change in voting behaviour . In the UK the Electoral Reform Society estimates that more than half the seats can be considered as safe . It has been claimed that MPs involved in the 2009 expenses scandal were significantly more likely to hold a safe seat . </P> <P> However, other voting systems, notably the part - list system, can also create politicians who are relatively immune from electoral pressure . </P>

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