Large numbers of Americans are unhappy with the idea of a Biden vs Trump rematch, polls show, but both the Democratic and Republican parties appear to be paralyzed, unable to do anything about it.There’s a reason why.Both parties are shells of their former selves, and strong political parties are the foundation of a healthy democracy, many political experts agree. For too long Americans have seen political parties as the villains, and individual politicians and voters as the heroes.That thinking has to change if American democracy is going to survive, Lee Drutman argues in a new study.