How does the 2020 presidential campaign compare to past campaigns in American history?

Many Americans have a growing concern about the health of the American political system due to the heightened partisan divisions between Democrats and Republicans, especially during the 2020 presidential campaign. How does the 2020 presidential campaign compare to past campaigns in American history? Is the growing partisan divide anything to be concerned about? Why or why not?

Book for course is The Enduring Democracy
Kenneth J. Dautrich, David A. Yalof, Christina E. Bejarano, 2020
Sage