Republican President William Howard Taft with his wife, Helen "Nellie" Taft, at a baseball game in New York on May 1, 1910. Of the first ladies, Nellie was the first to attend a national convention -- and it was for the opposing side. In 1912, she listened to speakers, including then New Jersey Gov. Woodrow Wilson, talk about her husband at the Democratic National Convention. (Topical Press Agency/Getty Images)