President Obama today used his executive authority to commute the prison term of Ceasar Cantu, a convict who otherwise would have spent an extra three and a half years behind bars thanks to a typo. In 2006, Cantu pleaded guilty to conspiracy to possess with intent to distribute marijuana and money laundering. His plea agreement with prosecutors resulted in Cantu falling under a base offense level of 34, meaning hed spend roughly 11 and a half years in jail. But in his pre-sentence report, that 34 number was mistakenly replaced with a 36 — tacking an extra 42 months onto Cantus prison stay.