Hannibal Hamlin (August 27, 1809–July 4, 1891) was a politician from Maine. Hamlin served as a lawmaker in Maine, Governor of Maine, in the U.S. House of Representatives, and in the U.S. Senate. He began his career as a Democrat but later became a Republican. He was the first Republican to serve as Vice President of the United States, elected as Abraham Lincoln's Vice President in the 1860 presidential election.