Why should he? It was never about the whistleblower but about the Government of U.S. First Bush administration, now Obama administration and the difference between the things they say and the things they do.
Edit: I just found some additional sources.
http://www.reuters.com/article/2013/07/24/us-russia-snowden-...
http://www.businessinsider.com/report-edward-snowden-is-now-...