straw poll vs voting

straw poll

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

voting

noun
  • action of the verb to vote 

adj
  • Having an associated right for the holder to vote as an owner of business. 

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