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CBS News poll: Biden leads Trump in Wisconsin, has edge in Arizona

CBS News poll: Biden leads Trump in Wisconsin, has edge in Arizona

A new CBS News Battleground Tracker poll finds former vice president Joe Biden ahead of President Trump in Arizona and Wisconsin, the states he won in the 2016 election. CBS News elections and surveys director Anthony Salvanto joins CBSN's Lana Zak to discuss why the president is trailing in both these critical states.