I created a custom object in Hubspot called SFDC Campaign and synced it with the Salesforce native campaigns object.
I enabled the contact association and set the primary association field to be campaign member. Basically, our hope is that the number of campaign members in Salesforce would match the number of Hubspot contacts associated with the SFDC campaign.
This unfortunately isn’t the case because the integration only creates associations between HubSpot custom objects and Salesforce Contacts, not Salesforce leads.
We need to be able to associate Salesforce leads with custom objects.