They came very close to nailing the top 3 with Lincoln.
Theassassination was planned and carried out by Cherie's relative (seriously),actor, John Wilkes Booth, as part of a conspiracy to rally the remaining Confederate troops to continue fighting.
Booth plotted with Lewis Powell and George Atzerodt to kill Secretary of State William H. Seward and Vice President Andrew Johnson. By taking out the top three in the line of succession, Booth hoped to throw the Union government into disarray.
Lincoln was shot while watching the play Our American Cousin at Ford's Theatre in Washington, D.C. with his wife, Mary Todd. . The rest of the plot failed. Powell only managed to wound Seward (seriously as he had had designs on becoming Pres himself, while Atzerodt, Johnson's would-be assassin, lost his nerve and fled.
Mary Todd Lincoln was aked "Never mind the incident, Mrs Lincoln, how did you find the play?"