[2] He attended the officers' training camp held at Fort Benjamin Harrison and received his commission as a second lieutenant of Infantry in August 1917.

[2] He was subsequently assigned to legal duties in the office of the judge advocate at Camp Zachary Taylor, Kentucky.

[1] In 1928, he was the Democratic nominee for a seat in the United States House of Representatives and was defeated by David Hogg, 55.3 percent to 44.7.

[2] On January 28, 1944, Jackson was appointed to the U.S. Senate, filling the vacancy caused by the death of Frederick Van Nuys.

[7] In 1944, he was the unsuccessful Democratic nominee for Governor of Indiana, losing to Republican Ralph F. Gates, 50.97 percent to 48.18.

[7] In 1946 he was hired for a three-year term as governor of the National Association of Commodity Exchanges and Allied Trades.

[2] The Izaak Walton League, an environmental conservation advocacy organization, included Jackson as a member.