In 2008, with help from Jay-Z and Puff, Barack Obama got the hip hop vote, and became the first African American to be elected president. For a brief moment, the "Audacity of Hope" seemed attainable. The 2014 Ferguson riots signaled the end of that hope, and in 2016 the hip hop community had to grapple with the election of Donald J. Trump as Obama's successor. Now more than ever, hip hop artists such as J. Cole and Kendrick Lamar are the voice...