Edward Dickinson Baker (February 24, 1811October 21, 1861) was an English-born American politician, lawyer, and military leader. In his political career, Baker served in the U.S. House of Representatives from Illinois and later as a U.S. Senator from Oregon. A long-time close friend of U.S. President Abraham Lincoln, Baker served as U.S. Army colonel during both the Mexican-American War and the American Civil War. Baker was killed in the Battle of Ball's Bluff while leading a Union Army regiment, becoming the only sitting senator to be killed in the Civil War.