"I am a temperance Republican down to my toes"

Billy Sunday's quote is a reference to his political beliefs. He was a staunch fan of the Temperance Movement, which sought to decrease or get rid of the consumption of alcohol. Sunday was a Republican, and his quote recommends that his commitment to the Temperance Movement was so strong that it became part of his really identity. He was a "temperance Republican down to his toes," meaning that his beliefs were deeply rooted and he was unwavering in his commitment to the cause. Sunday was a prominent figure in the Temperance Movement, and his quote works as a pointer of the value of staying real to one's convictions.