straw poll vs suffrage

straw poll

noun
  • A survey of opinion or a vote that is nonbinding, unofficial, casual, or ad hoc. 

suffrage

noun
  • A vote in deciding a particular question. 

  • Aid, intercession. 

  • Testimony; attestation; witness; approval. 

  • The right of women to vote. 

  • A prayer, for example a prayer offered for the faithful dead. 

  • A short petition, as those after the creed in matins and evensong. 

  • The right or chance to vote, express an opinion, or participate in a decision, especially in a democratic elections. 

How often have the words straw poll and suffrage occurred in a corpus of books? (source: Google Ngram Viewer )