Former president Theodore Roosevelt (1900-1908) ran for another term under the Progressive Party in 1912.

The answer is true because after serving as the 26th President of the United States from 1901 to 1909, Theodore Roosevelt ran for another term in the 1912 presidential election. However, instead of running as a Republican candidate, he formed his own political party called the Progressive Party, also known as the "Bull Moose Party," to challenge the incumbent Republican President William Howard Taft. Roosevelt's decision to run under the Progressive Party in 1912 reflects his dissatisfaction with the direction of the Republican Party and his desire to continue his progressive policies.