In March 1968, Johnson made his surprise announcement that he would not seek reelection, and Humphrey launched his campaign for the presidency. Loyal to the Johnson administration's policies on the Vietnam War, he received opposition from many within his own party and avoided the primaries to focus on winning the delegates of non-primary states at the Democratic Convention. His delegate strategy succeeded in clinching the nomination, and he chose Senator Edmund Muskie as his running mate. In the general election, he nearly matched Nixon's tally in the popular vote but lost the electoral vote by a wide margin. After the defeat, he returned to the Senate and served from 1971 until his death in 1978.