If you're so inclined, it's interesting to look back at other politicians' comments about pot.
Bill Clinton said he used it.
It's well established that Barack Obama used it.
There's even a Wikipedia page devoted to politicians who used it. (Assuming you can trust Wikipedia, which isn't a given.)
Now U.S. Sen. Marco Rubio, R-Florida, is the latest noteworthy politician who is being asked about his previous pot use. As the Washington Post has reported, the senator isn't exactly saying. But the newspaper makes a valid point by referencing a 2011 Pew poll:
"One in three Republican said they would be less likely to back a candidate who has used pot in the past while just two percent said they would be more likely to support that candidate. Six in ten said it wouldn't make any difference in how they would vote. Interestingly, marijuana usage is a far bigger negative in the eyes of Republicans than is being divorced. (Just 16 percent of Republicans said a past divorce would make them less likely to support a candidate.)"
-- Phillip Tutor