Is Jim Gordon Incorruptible?

Some stories seem to place Gordon on an even higher moral grounds than Batman himself. I was reading The Long Halloween, which as we all know involves the fall of Harvey Dent, and in the beginning of the story, Bruce says "I believe in Harvey Dent." Later on, he also says "I believe in Jim Gordon." We all know he was wrong with Harvey, so it got me thinking, is there any set of circumstances that could also result in Gordon's corruption?

Of course the difference between a "good guy" and "bad guy" is up to interpretation; for example, Batman breaks laws, but we know he's a good guy. So for the sake of this discussion let's set the bar at Harvey Dent. I believe that whatever happens, Bruce Wayne will never ever be a worse person than Two-Face. So, is there anything that could result in Gordon being another Two-Face?

Bonus question: IF Gordon WERE to corrupt and adopt the identity of a super villain devoted to both bringing down all mafia/supervillains in Gotham by any means and also destroying Batman, how effective would he be?

@nickzambuto: From what I've read and seen, he has faced lots of difficult times but never ended bad. So I would say he is incorruptible. Doesn't he even become Batman in the new convergeance serie ?

yes

Depends on what you consider corruption to be

@gustavoburciaga1: As said in OP, we're setting the bar as Harvey Dent/Two-Face.

In multiple origins, Harvey Dent already was bipolar and had other mental diseases but to a much lesser degree. So I don't think that Jimbo can turn into someone like Two face.

Yeah but are we talking about, killing someone? If that's the case, I'm sure he's killed people before. Or are we talking about going full on rogue and killing people for the hell of it and robbing banks etc...?

When he starts acting for his own gain (revenge) and kills innocent people for it.

No I don't think Gordon could be corrupted. That's the whole point if the character, the only good cop in Gotham when Batman came on the scene. And the only reason he was in Gotham was because he turned in dirty cops from his home town.

In Batman Earth One, he was, in the technical sense a corrupt cop, though he didn't do it by his own free will. He was corrupt in the sense that he looked the other way, and didn't put down the criminals when he had the chance. He was like this because he was being blackmailed by the Mayor, who, in the story, killed his wife and threatened to do the same to his daughter Barbara. But when Barabara is kidnapped, he regains his moral high ground and teams-up with Batman to save her. In Volume 2 he becomes the commish we know. That's the closest he's ever been to be "corrupted". Other than that, I don't see him going full rogue because he's already been through enough stuff that would turn others into "Two-Face" level baddies but his resolve has remained strong.

Mainstream James Gordon is, because what it matter for him isnt money.

Gotham Gravel

Jim Gordon is the sanity-guardian for Batman, so I'd be surprised if he went the way of Two-Face.

Maybe it's the quality of Gotham City that makes Two-Face seem sane.

Vigilantism and criminal insanity are never straightforward...

Is Jim Gordon Incorruptible?

Ultimately, yes. He may sometimes make bad decisions along the way, but in the end he does what's right.

My man Jim is a good guy.