The party also became known as the Bull Moose Party when former President Roosevelt boasted "I'm fit as a bull moose," before being shot in an assassination attempt prior to his 1912 campaign speech in Milwaukee, Wisconsin. What he said after he was shot was "It takes more than that to kill a Bull Moose." 
Inspiration for the party's beginnings may have come from Roosevelt's friend and supporter, U.S. Senator Thomas Kearns of Utah, who in October of 1906 broke off from the Republican Party and started the American Party in that state. This was a direct response to Mormon church leadership influence on the Senatorial elections between 1902 and 1905.