So the followup question is "what is the best way find the campaign by id number?"
Hi Curtis,
Click the email in the Marketo main UI. The URL will look like this:
The 4 digits after /#EM in the URL is the id of the email.
But this being said, where do you want to search it? in the Marketing activities, this campaign will not be available. the only place you can fin it is in the lead activity log.
-Greg