President Abraham Lincoln had won the 1860 presidential election as a member of the Republican Party, but, in hopes of winning the support of War Democrats, he ran under the banner of the National Union Party in the 1864 presidential election. At the party's convention in Baltimore in June, Lincoln was easily nominated, but the party dropped Vice President Hannibal Hamlin from the ticket in favor of Andrew Johnson, a War Democrat who served as the military governor of Tennessee. After the National Union ticket won the 1864 presidential election, Johnson was sworn in as vice president on March 4, 1865.On April 14, 1865, in the closing days of the Civil War, President Lincoln was shot  and mortally wounded by John Wilkes Booth, a Confederate sympathizer. The shooting of the president was part of a conspiracy to assassinate Lincoln, Vice President Andrew Johnson, and Secretary of State William Seward on the same night.