I am not aware of any other spy in the US who committed a similar offence to be in prison for so long. I sincerely believe that Pollard had moral difficulties with not letting the Israelis know about information on terrorists (which the US held back to "protect it's sources"). He has really been in prison long enought. Frankly, I have a problem with the American conception of black and white. In reality a lot is in between. It's not always just "you're for me or against me"..
Roadside bomb kills five border officers in western Iraq (AP)
from the article: Pollard's family asks Obama to let him attend father's funeral