And if false evidence or information was entered into the trial...
What part of "the defendants have benefit of defense counsel" do you not understand? If there is any truth to what you suggest, and if their defense attorneys are competent, then they have an excellent shot of having an appeal upheld.
The problem with people agitating for them to be pardoned (thereby aiding those who hate GWB), is that, if all they allege is true, then the men don't need a pardon. They should easily prevail on appeal. Instead, the hysteria and constant anti-GWB flogging of this case suggests to me that this is a phony cause and the men deserved to be convicted.