If he gets a jury trial then all of it is irrelevant. He can be acquitted for any reason whatsoever:
"This so-called right of jury nullification is put forward in the name of liberty and democracy, but its explicit avowal risks the ultimate logic of anarchy."
See: http://law2.umkc.edu/faculty/projects/ftrials/juryseminar/US... http://caselaw.findlaw.com/us-2nd-circuit/1382192.html
Essentially, while jury nullification does exist and should be upheld it is critical that jurors are aware of it beforehand or may be otherwise informed.
> "The answer may be that a tough judge is still a better option than a military jury picked from a pool of serving soldiers that widely considers Manning to be a traitor. "
http://www.telegraph.co.uk/news/worldnews/wikileaks/9901659/...