“No, I don’t think he understood that, but that is what it meant.”
What the donor understood was that Cruz would not fight gay marriage, because Cruz explained that he would let the states handle the issue. That means, with a Cruz presidency, gay marriage would remain intact.
Check out these links:
http://time.com/3476241/ted-cruz-constitutional-amendment-same-sex-marriage-laws/
http://www.newsmax.com/Politics/Ted-Cruz-gay-marriage-opposes-stance/2015/04/23/id/640479/
http://www.usnews.com/news/blogs/run-2016/2014/10/07/scott-walker-vs-ted-cruz-on-gay-marriage
http://www.cnn.com/2015/04/23/politics/ted-cruz-gay-marriage-2016-election/index.html
http://www.huffingtonpost.com/2015/03/11/ted-cruz-same-sex-marriage_n_6848032.html