The Obama administration has stepped up prosecutions of officials divulging classified information to the media partly because the electronic media leaves footprints which are easy to identify.
The other reason is that Congress has pressured the administration to find and indict government officials who leak classified documents, writes Steven Aftergood in Secrecy News. -db
From a commentary in the Secrecy News, April 23, 2012, by Steven Aftergood.