Victoria Woodhull
In 1872, Woodhull ran for President of the United States. While many historians and authors agree that Woodhull was the first woman to run for President of the United States, some have questioned that priority given issues with the legality of her run. They disagree with classifying it as a true candidacy because she was younger than the constitutionally mandated age of 35.  However, election coverage by contemporary newspapers does not suggest age was a significant issue.  The presidential inauguration was in March 1873. Woodhull's 35th birthday was in September 1873.