Abstract
This article investigates the role of thwarted voters and newcomers in setting the result of the December 6th, 2009 presidential runoff in Romania. For this purpose it employs panel survey data from the Romanian Election Studies, collected across three waves: pre-election, between the two rounds, post-election. Initially, it draws a picture of the main evolutions in turnout and vote between the first and the second round, with a special emphasis on vote transfers and risks associated to turnout and pro-winner overreporting. Then it analyzes the thwarted voters and their rationalities of making second-order electoral choices in the presidential runoff. The influence of campaign developments and long-term party/candidate preferences is assessed. Finally, the article investigates the profile of newcomers (people only voting in the runoff) and the mechanisms of political mobilisation in their case. A special attention is given to how newcomers make the electoral choice in the presidential runoff and to the influence of the campaign developments on that choice.