FILE - In this Jan. 10, 2009 file photo, a Secret Service agent stands watch while President-elect Barack Obama, not shown, visits the Lincoln Memorial with his family, none visible, i

 

              FILE - In this Jan. 10, 2009 file photo, a Secret Service agent stands watch while President-elect Barack Obama, not shown, visits the Lincoln Memorial  with his family, none visible, i
FILE - In this Jan. 10, 2009 file photo, a Secret Service agent stands watch while President-elect Barack Obama, not shown, visits the Lincoln Memorial with his family, none visible, in Washington. The 16th president was one of America's most admired, rising from humble roots in a frontier cabin to become a self-educated lawyer and brilliant politician. As president, he ended slavery by issuing the Emancipation Proclamation and preserved the nation despite the Civil War. The story of his assassination is one of the best-known chapters of American history. Many museums are offering special exhibits for the 150th anniversary of the Civil War and the Emancipation Proclamation. Other sites can be visited any time: You can see the box at Ford's Theatre where Lincoln was shot, stand in the room of the house where he died, walk up the steps of the cottage where he summered, and join the nearly 6 million people who visit the Lincoln Memorial each year. (AP Photo/Gerald Herbert, File)