Harris' big test: reclaiming swing states for Dems

For all of the enthusiasm and cash Vice President Kamala Harris' campaign is generating for Democrats, her true tests are about to begin.Why it matters: To beat Donald Trump, Harris will have to overcome President Biden's polling deficits — and questions about how well she'll fare with working-class voters in the crucial "Blue Wall" swing states of Pennsylvania, Michigan and Wisconsin.

The Californian likely will need to win all three without "Scranton Joe" — the monicker Biden used to remind Pennsylvania voters of his working-class roots when he won the presidency in 2020.

Harris also polled stronger than Biden with Black voters and younger voters. In Michigan, Real Clear Politics found that Trump led by about 2 points from an average of Trump-Harris polls.