Can a Vice-Presidential Debate Shift the Polls? History Shows It's Unlikely.
Briefly

"There is little evidence that vice-presidential debates have a meaningful impact on elections overall. Over the last six presidential election cycles, there was only one time when national polls moved more than one percentage point after a vice-presidential debate and before the next presidential debate."
"What these debates can do is give voters more familiarity with the running mates for better or worse. Polls show that about one in five Americans have no opinion of Mr. Vance, the Republican, and a quarter of Americans have no opinion of Mr. Walz, the Democrat."
Read at www.nytimes.com
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