re: 2015 per Q

June 20 2015

Donald Trump surged into the lead for the 2016 Republican presidential nomination, with almost twice the support of his closest rival.

https://www.washingtonpost.com/politics/poll-trump-surges-to-big-lead-in-gop-presidential-race/2015/07/20/efd2e0d0-2ef8-11e5-8f36-18d1d501920d_story.html

poll data here

http://apps.washingtonpost.com/g/page/politics/washington-post-abc-news-poll-july-16-19-2015/1778/