Using election returns, public opinion surveys, and legislative roll-call data from many mixed systems in every world region, the authors show that contamination systematically affects party strategy, voting behavior, legislative cohesion and the overall structure of partisan competition.

Using election returns, public opinion surveys, and legislative roll-call data from many mixed systems in every world region, the authors show that contamination systematically affects party strategy, voting behaviour, legislative cohesion and overall structure of partisan competition.

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