Crucial Vote in US Primary Elections

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Another big day of presidential voting in the United States - Hillary Clinton and Donald Trump score big wins in Florida - the latter forcing Marco Rubio out of the race. A look at the mathematics of delegate counting - and discussion on which of the remaining candidates has a credible foreign policy. Also on the programme - General Wesley Clark on the geo-politics of war and possible peace in Syria. And a royal initiative on behalf of the world's endangered wildlife. Fergus Nicoll is joined by guests Professor Peter Morici of the University of Maryland in Washington DC and Madhavan Narayanan a columnist and tech writer on the Hindustan Times. Image: A man enters a polling station to cast his ballot. Credit: MICHAEL B. THOMAS/AFP/Getty Images.