Running into a similar situation. We're running a clicktools survey campaign, connected to SFDB and Marketo. I created a token to associate the campaign in SalesForce, but for some reason it's not filling into the field properly. {{lead.FullName}} and the email address token are working fine, but either the campaign token we're choosing isn't the proper one, or something else is going on.
So far we've used a custom token, CampaignID and CampaignName to no avail. I feel like this could be a pretty powerful tool once it's working correctly, especially for customer satisfaction surveys, but there's no real documentation, other than the blog post, anywhere that I can find.