Lincoln's victory made him the first president to win re-election since Andrew Jackson in 1832, as well as the first Northern president to ever win re-election. Lincoln was assassinated less than two months into his second term, and he was succeeded by his vice president, Andrew Johnson, who favored quick restoration of the seceded states to the Union without protection for the former slaves. This led to conflict with the Republican-dominated Congress, culminating in his impeachment by the House of Representatives in 1868. He was acquitted in the Senate by one vote.