text: 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.Lincoln has been also admired by political figures outside the U.S., including German political theorist Karl Marx, Indian independence leader Mahatma Gandhi, former Liberian president Ellen Johnson Sirleaf, and Libyan revolutionary Muammar Gaddafi.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.While he is usually portrayed bearded, he did not grow a beard until 1860 at the suggestion of 11-year-old Grace Bedell.He was the first of five presidents to do so.He has been memorialized in many town, city, and county names, including the capital of Nebraska.The United States Navy is named after Lincoln, the second Navy ship to bear his name.