We examine the effects of introducing a political outsider to the nomination process leading to an election. To this end, we develop a sequential game where politicians -- insiders and outsiders -- make a platform offer to a party, and parties in turn decide which offer to accept
this process conforms the voting ballot. Embedded in the evaluation of a party-candidate match is partisan affect, a variable comprising the attitudes of voters towards the party. Partisan affect may bias the electorate's appraisal of a match in a positive or negative way. We characterize the conditions that lead to the nomination of an outsider and determine whether her introduction as a potential candidate has any effect on the winning policy and on the welfare of voters. We find that the victory of an outsider generally leads to policy polarization, and that partisan affect has a more significant effect on welfare than ideology extremism.