If attendees at the Iowa State Fair were looking for a candidate to end the federal government’s failed war on drugs, they would have few choices judging from the speeches at the Des Moines Register’s Political Soap Box.  Every four years, candidates for president flock to this quadrennial staple of the Iowa Caucuses for their 20 minutes before fairgoers for what is essentially presidential speed dating. One after the other over a few days, would-be nominees climb the stage and offer up their best…