Years ago Bill Clinton's campaign manager, George Stephanopoulos, wrote in giant letters on the wall at the main campaign headquarters, "IT'S THE ECONOMY, STUPID!" Of course, Clinton won that election, and the next, because for all his human foibles, Clinton understood one key thing:
all elections, yes, every one, turns on pocketbook issues--can people afford groceries, gas, rent or mortgage, etc.?
In very simple terms, Harris' campaign forgot that. People voted for Clinton for a second term, even after he put a cigar up a barely legal intern's vagina in the Oval Office, because he never forgot what elections are about. The economy, stupid. Bush didn't forget, Obama didn't forget, Biden didn't forget, and Trump didn't forget. Harris did. And it's really that simple.
People will vote for the devil if they're hurting. And with the huge rise in the cost of living, a lot of working class Americans are hurting.