Hi John,
You can try this solution. It may work for you:
- Create a new custom field in Marketo for "60 Days Activity"
- Create a Smart campaign and run a trigger for this new field - All the leads with activity in past 60 days, the lead should get added to a Smart List - 60 Days Active.
- Now when you create a campaign and a smart list, you can add a filter wherein your leads is not in this '60 days Active' Smart list.
Let me know if this works for you.
Regards
Alok