Vice President Kamala Harris, the Democratic Party’s nominee, is hoping to shatter a nearly 250-year-old glass ceiling to become the nation’s first-ever female president. Former President Donald Trump, the Republican nominee, is trying to become just the second defeated president in history to win a nonconsecutive term. Polls nationally and in the vital swing states show no clear leader, reflecting a country that is polarized just as sharply as when the race started.