Patti Davis, Ronald Reagan's daughter, recently speculated on where her father might stand on same-sex marriage. Politico published her thoughts under the headline, "Patti Davis says Reagan wouldn't have opposed gay marriage."
The impact of the article was immediate. A quick Google search yielded multiple follow-up articles and blog posts. Liberals nationwide were off and running with a new same-sex marriage endorsement: this one from Reagan, the conservative's conservative.
Source: CNN. Read full article. (link)