On the night in 2008 when Barack Obama was elected the country's first black president, many black Americans wept. Eight years later, they weep again for the end of an era some thought they would never live to see — and for the uncertain future they face without him. Perhaps nowhere was the surreal moment more evident than at the Smithsonian National Museum of African-American History and Culture, where a sea of black faces gathered to say goodbye and to celebrate a history of struggle and progress. "This year marks the most significant, most poignant and really the most important Martin Luther King Jr. celebration of my lifetime," said James Peterson, professor of English and Africana studies at Lehigh University. "There's never been a clearer case, in terms of presidential politics and the general direction of the country, where King's edicts are more pertinent than they are now."