Northern Trail Outfitters Is using one profile for all of its marketing users, providing read-only access to the Campaign object. A few marketing users now require comprehensive edit access on Campaig

Organization-Wide Defaults (OWD) set the baseline record access for everyone; they cannot be used to grant more permissive access to a subset of users.

Permission Sets could be used to grant object and field permissions, but the 'Marketing User' checkbox is a specific, bundled permission designed for campaign management, making it the most direct and idiomatic solution for this request.

In Salesforce, the 'Marketing User' checkbox on a user record grants access to create, edit, and delete campaigns, as well as access advanced campaign functionality. This is the standard and most direct way to provide comprehensive edit permissions for campaigns, overriding profile-level read-only settings for the Campaign object itself.

Field-level security controls access to individual fields, not comprehensive object-level create, read, update, and delete permissions for the Campaign object itself.