Candidates fight for a diminishing number of undecided voters, who are feeling a mix of fatigue, excitement and fear

Kamala Harris stood before a cheering crowd of hundreds of her supporters in Philadelphia and promised that she would deliver in Pennsylvania, a battleground state considered a must-win in the electoral college.

“Nine days left in one of the most consequential elections of our lifetime, and we know this is going to be a tight race until the very end,” the vice-president told supporters in Philadelphia last weekend. “And make no mistake: we will win.”