Edward Snowden, like Manning, could find himself taken to court by the US government after he unmasked himself Sunday as the person who exposed the nation's secret phone and Internet surveillance programmes to reporters.
Legal experts closely following both cases said they were shocked to find out young, low-ranking people had such access to powerful government secrets. Manning was 22 when he turned over the military and diplomatic cables about three years ago. Snowden is 29.
Legal experts saw differences between the two cases, namely that Manning's secret-spilling was more random, while Snowden appeared more selective.
"I'm not awarding him the Presidential Medal of Freedom here," Eugene R Fidell, who teaches military law at Yale Law School, said of Snowden.
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"I'm just saying you could say it is something more akin to educating the American public about sensitive surveillance issues that have some level of First Amendment concern attached to them."
Fidell said it could spur outrage about government secrecy in general, but it also could underscore the dangers of leaks and that, he said, won't help Manning.
Manning is charged under federal espionage and computer fraud laws. The most serious charge against him is aiding the enemy, which carries a potential life sentence.
Manning's attorney said he was young and naive but a good-intentioned soldier who wanted to make the world a better place by exposing the way the US military was conducting itself.
Manning never publicly acknowledged his actions until more than two years after his arrest. He was seized after an informant turned him in. Snowden was hiding out in Hong Kong, perhaps eventually hoping for asylum somewhere.