Map of which states' U.S. Senators support same-sex marriage per List of supporters of same-sex marriage in the United States
  Both Democratic U.S. Senators support SSM
  One Democratic U.S. Senator supports SSM
  One Independent and one Democratic U.S. Senator support SSM
  One Democratic and one Republican U.S. Senator support SSM
  One Independent and one Republican U.S. Senator supports SSM
  One Republican U.S. Senator supports SSM
  No position for U.S. Senator
Blank US Map.svg
Blank US Map.svg: Theshibboleth
derivative work: Nkocharh