Harris hopes to capitalize on Polish Americans' historic animosity toward Russia and on Trump's hesitancy to back Ukraine during last week's debate. The Democratic vice president's team organized a national call with Polish American supporters on Wednesday to encourage local networks to hold their own events and spread the campaign's message.

A political ad that supports Vice President Kamala Harris' candidacy is aimed at Polish-American voters. The ad was posted on the Polish-Americans for Biden Facebook page.

Polish Americans are an important, if politically overlooked, demographic. But in Pennsylvania, many have tended to lean Republican.