Sean Wilentz addresses the subject in a review of Michael Kazin's American Dreamers, a history of the American left:

Alienated novelists, poets, playwrights, filmmakers, and songwriters, Kazin argues, as well as muckraking journalists and left-wing historians, have influenced many more Americans than would ever embrace a radical political movement. From Harriet Beecher Stowe to Bruce Springsteen, he finds a persistent radical artistic imagination that he believes has been the left’s mightiest weapon. To understand American radicalism’s humanizing power, and how the left changed the nation, it is less important, in Kazin’s view, to consider how Americans voted than to consider what books and magazines they read, what plays and movies they attended, and what songs they heard and sang.