The worst strategic mistake Hillary Clinton made in her 2016 campaign for president, many analysts believe, was overconfidence about three states Democrats had won in every presidential election since 1992 — Michigan, Pennsylvania and Wisconsin.



a person standing in front of a car: Democratic presidential candidate Joe Biden campaigns in Warren, Mich., on Wednesday. (Patrick Semansky / Associated Press)


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Democratic presidential candidate Joe Biden campaigns in Warren, Mich., on Wednesday. (Patrick Semansky / Associated Press)

No one is going to accuse Joe Biden of taking those states for granted.

The Democrats’ presidential nominee is showering money, staff and time over those states — the “blue wall” that crumbled when Donald Trump’s victories by tiny margins in all three propelled him to the White House.

By this weekend, Biden will have made five trips to those battleground states in less than two weeks.

He traipsed across Pennsylvania as he began venturing from quarantine in his Delaware home last month. On Friday, both he and Trump are scheduled to

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