The election is less than a month away, and the country has been roiled for months over a series of crises exposing deep partisan rifts: a pandemic that has killed more than 210,000 Americans; an economy that has lost millions of jobs as a result; street protests over police brutality that have included instances of rioting; a contentious fight over a Supreme Court seat that could be asked to decide the election; and the COVID-19 diagnosis of the president, his top aides and some senators.