suggested that postmodernism and multiculturalism have diluted greatness as a concept. In the Cold War years, Lincoln's image shifted to a symbol of freedom who brought hope to those oppressed by Communist regimes. He had long been known as the Great Emancipator, but, by the late 1960s, some African American intellectuals, led by Lerone Bennett Jr., denied that Lincoln deserved that title. Bennett won wide attention when he called Lincoln a white supremacist in 1968. He noted that Lincoln used ethnic slurs and told jokes that ridiculed blacks. Bennett argued that Lincoln opposed social equality and proposed that freed slaves voluntarily move to another country. The emphasis shifted away from Lincoln the emancipator to an argument that blacks had freed themselves from slavery, or at least were responsible for pressuring the government to emancipate them. Defenders of Lincoln, such as authors Dirck and Cashin, retorted that he was not as bad as most politicians of his day and that he was a "moral visionary" who deftly advanced the abolitionist cause, as fast as politically possible. Dirck stated that few Civil War scholars take Bennett seriously, pointing to his "narrow political agenda and faulty research". By the 1970s, Lincoln had become a hero to political conservatives—apart from neo-Confederates such as Mel Bradford, who denounced his treatment of the white South—for his intense nationalism, his support for business, his insistence on stopping the spread of slavery, his acting on Lockean and Burkean principles on behalf of both liberty and tradition, and his devotion to the principles of the Founding Fathers. Lincoln became a favorite of liberal intellectuals across the world. Barry Schwartz wrote in 2009 that Lincoln's image suffered "erosion, fading prestige, benign ridicule" in the late 20th century. On the other hand, Donald opined in his 1996 biography that Lincoln was distinctly endowed with the personality trait of negative capability, defined by the poet John Keats and attributed to extraordinary leaders who were "content in the midst of uncertainties and doubts, and not compelled toward fact or reason". In the 21st century, President Barack Obama named Lincoln his favorite president and insisted on using the Lincoln Bible for his inaugural ceremonies. Lincoln has often been portrayed by Hollywood, almost always in a flattering light. Memory and memorials Lincoln's portrait appears on two denominations of United States currency, the penny and the $5 bill. His likeness also appears on many postage stamps.