All eyes have turned to Nevada and its Democratic caucus. Bernie Sanders has the chance to cement his frontrunner status with a strong showing, and the other candidates are looking for opportunities to challenge him. The arrival of Michael Bloomberg on the debate stage shakes things up, with every candidate seeking to take on his controversial campaign. And with the memory of the botched Iowa caucus still fresh, Tom Perez, the president of the Democratic National Committee, is on the ground in Nevada to make sure this caucus runs smoothly.