Democratic presidential candidate, former Maryland Gov. Martin O'Malley, left, talks with an attendee at a round table meeting in Denver, Thursday, Sept. 17, 2015. O'Malley met with Colorado officials and marijuana activists and business owners in Denver Thursday, where he repeated his pledge to reclassify marijuana under federal drug laws if elected. (AP Photo/Brennan Linsley)
Democratic presidential candidate, former Maryland Gov. Martin O'Malley, left, talks with an attendee at a round table meeting in Denver, Thursday, Sept. 17, 2015. O'Malley met with Colorado officials and marijuana activists and business owners in Denver Thursday, where he repeated his pledge to reclassify marijuana under federal drug laws if elected. (AP Photo/Brennan Linsley) Brennan Linsley AP
Democratic presidential candidate, former Maryland Gov. Martin O'Malley, left, talks with an attendee at a round table meeting in Denver, Thursday, Sept. 17, 2015. O'Malley met with Colorado officials and marijuana activists and business owners in Denver Thursday, where he repeated his pledge to reclassify marijuana under federal drug laws if elected. (AP Photo/Brennan Linsley) Brennan Linsley AP

How evolving public attitudes on marijuana could affect the 2016 presidential race

November 02, 2015 08:38 PM