Both the Republican and Democratic presidential races are very competitive and as candidates scramble for delegates, they are turning state-by-state campaigns into congressional district-by-congressional district campaigns. Guests explain how the U.S. delegate system does — and doesn't — work.
Anna Greenberg, partner with Greenberg, Quinlan, & Rosner, a democratic political consulting firm
Vin Weber, former Republican congressman from Minnesota; now a Republican strategist and lobbyist
Debbie Dingell, member of the Michigan Democratic Party
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.