There doesn't seem to be any way to create a Campaign in Salesforce in either Salesforce (Legacy) or Salesforce. Obviously Campaigns are one of the most common objects in Salesforce, so this is a must.
Using Salesforce: Option 1: Using Trigger to Find or Create Record in Salesforce 'Campaign' is an available Salesforce Object But when chosen with 'Create Salesforce Record if it doesn’t exist yet?' none of the Campaign fields are available to be set Error because there are no fields: Bargle. We hit an error searching for (or creating) a record. Could not create record of the "Campaign" object: entity type cannot be inserted: Campaign
Option 2: Using Trigger Create Record in Salesforce 'Campaign' is not even an option in Salesforce Objects list
Salesforce (Legacy) Option 1: Trigger Create Campaign in Salesforce (Legacy) None of the Campaign fields populate. Error when trying to send it through which makes sense since there are no fields: :{"message":"entity type cannot be inserted: Campaign","errorCode":"CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY","fields":;]}]