The former Baltimore mayor, Maryland governor and likely presidential candidate discusses police brutality and why cities are key to changing AmericaMartin O’Malley’s campaign for president has not even begun, but already his plans to challenge Hillary Clinton for the Democratic nomination have been blown off course by the death of Freddie Gray and the violence that engulfed his home city of Baltimore last week.In a long interview with the Guardian over chicken quesadillas in a north Baltimore Irish pub on Sunday, O’Malley, who is expected to launch a bid for the presidency in the next month, reflected on the turmoil that his adopted hometown had seen in recent weeks in the aftermath of Gray’s death in police custody.