Joe Biden is about to select his vice-presidential running mate, having pledged to choose a woman. Will the pick change his chance of victory or the future of the Democratic Party? New research suggests running mates may not have the direct influence that most expect—but they do send strong signals about presidential candidates and their parties. Christopher Devine and Kyle Kopko find that vice presidential nominees do not have home state or regional effects and do not seem to help attract affiliated social groups like women. But popular running mates can rub off on nominees’ popularity and change how the voters see them ideologically. William Adler and Julia Azari find that running mates are a party decision; parties try to balance their ideological coalitions, with a variety of inputs from public and elite co-partisans. Biden's pick will help define the candidate and his party.

Photo Credit: Gage Skidmore under CC by SA 2.0.
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