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Webmaster tools does not show any links pointing to this page. I've searched for the full url in "" and can't find it in Google.
So having ruled out an accidental or malicious link I'm obviously concerned that this is a dupe content issue apparently created by Google themselves!
I'm gonna notify Google but I plan 301 this tracking url to the home page; this shouldn't affect anything in Analytics should it?
Anyway: yes, if you 301 this page it won't be properly counted by Google Analytcs (GA from now on).
Solution: block your campaign URL's in the robots TXT. No link juice? Yes, no link juice. If anyone knows a way please post it.
BTW: they're not Google Banners, they're yours. You have control whether you want them to be indexed or not. Google has no right to decide it.