Smith v. Allwright , 321 U.S. 649 (1944), was a landmark decision of the United States Supreme Court with regard to voting rights and, by extension, racial desegregation. It overturned the Texas state law that authorized the Democratic Party to set its internal rules, including the use of white primaries. The court ruled that it was unconstitutional for the state to delegate its authority over elections to the Democratic Party in order to allow discrimination to be practiced. This ruling affected all other states where the party used the white primary rule.