TL:DR, Ed will not be pardoned, as an object example to a potentially very leaky age.
Per TFA: For the first 80 years of its life, it was used almost entirely to prosecute spies. The president has prosecuted more whistleblowers under the Espionage Act than all president before him combined. His Justice Department has vastly expanded the scope of the law.
There's a good reason for this. The digitization of most current technical, planning, organizational, and intelligence information means that it can be distributed in mass in ways detrimental to the interests of the United States by any metric. Manning and Snowden have demonstrated the risk from users inside the system. One can lock down systems, but all for not unless the vast majority of users elect not to try. Like so many aspects of criminal law, so many perps slip through without justice being meted out, that those who do get caught, tried, and convicted oftentimes get the book thrown at them as an example to others. "See Dick do something bad? Don't be a Dick." This isn't going to change in the foreseeable future.
So, while Chelsea and Ed may have provided a degree of public service by bringing to light certain practices "we" as a body would prefer the government not engage in, they also dumped boatloads of information that do nothing - much less than nothing - to protect the liberties of Americans. So, Ed will remain a wanted suspect, and if caught and convicted like Chelsea, will do hard time.