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None of the three finalists – Pennsylvania Gov. Josh Shapiro, Minnesota Gov. Tim Walz and Arizona Sen. Mark Kelly – were shown in the polling data as moving the Harris-Trump national match up beyond the margins, two sources familiar said. The same was the case in a range of the most critical battleground states.

Both Shapiro and Kelly were shown to improve the Democratic ticket's chances against Donald Trump in Pennsylvania and Arizona, respectively, but those improvements were only on the margins, the source added.

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