It depends on which internship the application is for. In general, a sincere commitment and potential personal connection to the item at hand can give a real boost. Otherwise, the classic motivation, attention to detail, and familiarity with the organization/issue are good to emphasize.
There is no particular mentor program, but there are a lot of presentations with upper management and outside speakers that offer more room for networking as well as chances to forge personal connections and learn a lot about their career paths and recommendations. It's incredibly fun and helpful.
Relationship with Upper Management
The job definitely provided good exposure to the field, bringing contact with other organizations as well as real day-to-day admin and research work. It's impressed interviewers in applications since leaving.