Politicians that have admitted to recreational use following prohibition include mayors, Governors, members of the House of Representatives, Senators, and Presidents. see http://en.wikipedia.org/wiki/List_of_United_States_politicians_who_admit_to_cannabis_use
This is an incomplete list, which may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.
Former Vice President of the United States Al Gore
President of the United States Barack Obama
Former Governor of Alaska Sarah Palin
Former Governor of California Arnold Schwarzenegger