Callahan was chaired the Democratic Party of Wisconsin from 1925 to 1927 . He was twice a candidate for Secretary of State of Wisconsin . In 1910 , he lost to incumbent and future U.S. Representative James A. Frear and in 1924 , he lost to incumbent a future Governor of Wisconsin Fred R. Zimmerman . Callahan was a delegate to the 1924 Democratic National Convention . At the convention , his name was put into play for the Democratic Party 's nominee for President of the United States . The nomination eventually went to John W. Davis , who lost to incumbent Calvin Coolidge in the general election . Callahan was also a delegate to the 1928 Democratic National Convention . In 1934 , he was a candidate for the United States Senate , losing to incumbent Robert M. La Follette , Jr .
1928 Democratic National Convention
1928 Democratic National Convention
John M. Callahan