Supposedly because he liked to listen to and deliver speeches, he enrolled in the Kansas City School of Law, and graduated in 1900.

He was admitted to the Missouri bar in 1901 and began practice in Maryville; he moved shortly thereafter to Okmulgee, [a] where he became city attorney.

[1] Originally, Moore's political views aligned with the Democratic party, but he became disillusioned with Roosevelt's New Deal during the 1930s.

When Roosevelt announced that he would run for a third-term, Moore campaigned vigorously for the Republican candidate, Wendell Willkie.

W. B. Pine, the Republican nominee for Senate, had just died, and Josh Lee, the Democratic incumbent was popular.

He unsuccessfully tried to stop Leland Olds getting a second term as Chairman of the Federal Power Commission due to being "opposed fundamentally to private enterprise" and "Communistic".