In 1976, Bob Dole and Walter Mondale took part in the first formal vice-presidential debate. Nearly 50 years later, vice presidential nominees JD Vance and Tim Walz are meeting on the debate stage. George Washington University professor and political historian Matt Dallek says a lot has changed in that time. He joins Soledad O’Brien to explain why these picks for vice president are more significant than those of the past and how their performances in the debate could impact the success or failure of their tickets  

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