Pollard was paroled after spending almost 30 years in prison - nearly the length of Manning's sentence. It's not a 'get out of jail card' you want to be wishing on her.
I'm just pointing out it's not much of a supporting example. Pollard's sentence was not commuted. He was paroled in accordance with guidelines at the time of his sentencing. He spent 29 years in prison. If you want some kind of clemency for Manning, well, Pollard's case doesn't demonstrate or involve clemency.