Each year, the North Carolina College Democrats (a member in which Duke Democrats is a member) releases a list of policy internships for students to apply to. Here is the 2015 list:

https://docs.google.com/spreadsheets/d/1KqJVKHB7vEdJHU9yf8BpKkwQJX_PX9Wquvntv3H4z4s/edit#gid=0