Both Trump and Biden have called the other "an existential threat to the country"
It is fairly obvious to people who get their news from foreign sources or read the Constitution (which at times seems like it applies to a different country) that Neo-Conservatism morphed into the cult of Trump's personality is a threat to the American democratic experiment.
What is not so obvious is how Clintonian Neo-Liberalism is a threat to our country and the world. Joe Biden was complicit in the un-doing of the New Deal under 16 years of Democrat presidents and also Democrat majorities in the House and Senate. He wrote the Crime Bill that funded SWAT teams and military gear for domestic policing, expansion of private prisons, and chasing down marijuana users that were disproportionately persons of color. That's right, Joe Biden un-intentionally attacked millions of African-American families.
Clintons' "Triangulation" policies of looking for the middle of political consensus became capitulation to predatory capitalism in many other areas, because since the late '70s billionaires had been funding right wingnut think tanks to shift the discourse towards the fascist right of corporate power.
The Clinton administration de-regulated financial services, which led to stock bubbles and a world wide crash in 2007 that FDR's legislation prevented for 60 years. They de-regulated media, which led to consolidation, lying on news programs and extreme polarization of public discourse, again un-doing the rules that kept news relatively honest and fair since the 1933 and 1935 Communications Acts.. They also blockaded and bombed the Middle East, which caused bloodshed, eco-destruction, famine, disease and fed the rise of jihadist terrorism.
The Obama Administration, with Biden as #2 and Secretary Clinton as #3 continued the bombing and disruption in he Middle East, causing state failures in Iraq, Syria, and Libya. They took the Right Wing side in Israel, suppressing the Palestinians, which is a move away from peace. They tripled arms sales into the Middle East, providing the weapons for two on-going genocides from the Theocratic regimes of Israel and Saudi Arabia.
All told, Obama dropped more bombs than during the Vietnam War, and conducted more illegal aerial invasions of sovereign nations the Nixon an Kissinger - except this time, they did not try to keep it a secret. They acted under the protection of the American Service-Members Protection Act, which "authorizes the U.S. president to use "all means necessary and appropriate to bring about the release of any U.S. or allied personnel being detained or imprisoned by, on behalf of, or at the request of the International Criminal Court".
The US is officially an international outlaw state, and many actions directly ordered by our Presidents are defined as GENOCIDE under the Geneva Convention. (Drone strikes that hit civilians, bombing civilian resources like hospitals, government buildings, crops, herds, dams, water and sewer treatment facilities, electrical generating stations, etc.)