The 2016 presidential primaries have been full of twists, turns, polling upsets and “did that person really say that” moments. But, ultimately, both the Republican and Democratic races come down to delegates and math. FiveThirtyEight’s delegate tracker shows you the current delegate counts and whether a candidate is on track to clinch the nomination. In this video, FiveThirtyEight’s Jody Avirgan and David Wasserman take the tracker for a spin.