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This paper intends to shed new light on the causes of split-ticket voting in concurrent multi-level national and regional elections held under PR electoral rules. Up to now, differences in electoral outcomes in Spanish concurrent elections have been understood as a product of the mechanisms associated with second order elections. Evidence against this interpretation is presented, and alternative explanations from the international literature are tested. We find that, on one hand, Andalusian intrablock and regionalist ticket-splitters weigh their national and regional electoral choices differently: While in the national arena ideology is the main predictor of electoral behavior, at the regional level ticket-splitters tend to cross ideological lines and vote based on the performance of regional politicians or a preference for local leaders. On the other hand, interblock ticket-splitters seem to balance their votes ideologically. [ABSTRACT FROM AUTHOR]