Edmund G. Ross
Edmund Gibson Ross was a politician who represented Kansas after the American Civil War and was later governor of the New Mexico Territory. His vote against convicting President Andrew Johnson of high crimes and misdemeanors allowed Johnson to stay in office by the margin of one vote. As the seventh of seven Republican U.S. Senators to break with his party, Ross proved to be the person whose decision would result in conviction or acquittal. When he chose the latter, the vote of 3519 in favor of Johnsons conviction failed to reach the required twothirds vote. Ross lost his bid for reelection two years later.
Edmund Gibson Ross was born in Ashland, Ohio, and attended high school in Sandusky, Ohio. He worked in the newspaper business, first in Sandusky, Ohio, then in Milwaukee, Wisconsin and Topeka, Kansas. After the suicide of James H. Lane in 1866, Ross was appointed and then elected to the United States Senate as a member of the Republican Party. He became a Democrat in 1872.
Source: Wikipedia