PT no purgatório: ambivalência eleitoral no primeiro turno das eleições presidenciais de 2010.

In this paper we investigate the patterns of electoral volatility, at the individual level, in the 2010 Brazilian presidential elections. We explain variation in vote intention before the first round between candidates José Serra, Marina Silva, and Dilma Rousseff. A special emphasis is given to the effects of perceptions of corruption and abortion, two hot campaign issues, to explain the final result of the first round. The analysis is based on the first Brazilian Electoral Panel Study (BEPS), which has three waves of interviews with the same nationally representative sample, allowing for measures of how voters changed their minds during the electoral campaign. Results indicate that perceptions about corruption, primed by the eruption of corruption scandals, more than the debate on abortion, stimulated a loss of votes for Dilma Rousseff. [ABSTRACT FROM AUTHOR]