A presidential campaign long muffled by the coronavirus pandemic will burst into a newly intense and public phase after Labor Day, as Joseph R. Biden Jr. moves aggressively to defend his polling lead against a ferocious onslaught by President Trump aimed chiefly at white voters in the Midwest.
Private polls conducted for both parties during and after their August conventions found the race largely stable but tightening slightly in some states, with Mr. Trump recovering some support from…
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