How Spain voted

Both Chris Brooke and Matthew Turner have raised the suggestion that the Socialist victory in Spain may not have been caused by an actual swing in the electorate from the Popular Party (PP) to the Socialists (PSOE) after Thursday, but rather by the attacks in Madrid inspiring more people to go out and vote. With the majority of these new voters trending towards the left and the PSOE, the argument goes, this meant that they can attribute their victory to these new voters, rather than voters who switched from the PP to the PSOE.

Curious about whether or not this is true, I took a look at the actual election results and there is evidence there to support this view. However, any conclusions from this evidence are necessarily tentative and speculative, as the evidence could be interpreted many ways.
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