 Siler did not sign the 1956 Southern Manifesto, and voted in favor of the Civil Rights Acts of 1957 and 1960, as well as the 24th Amendment to the U.S. Constitution, but did not vote on the Civil Rights Act of 1964.Siler was critical of U.S. involvement in Vietnam.In 1964, after deciding not to seek reelection, he quipped, in jest, that he would run for President as an antiwar candidate—he pledged to resign after one day in office after ordering the troops brought home.