The race to be a presidential candidate this year is so tight that attention is turning to counting every last delegate available.
But the process for winning delegates is quite complicated. Some states base it on the percentage of the popular vote, while others use a winner-take-all strategy. And what exactly is a "super delegate"?
To answer some of these questions, Melissa Block talks with Burdett Loomis, a professor of political science at the University of Kansas.