Zeinab Badawi interviews Dr Kizza Besigye, a former ally of Uganda's President Museveni who has become his biggest critic and the country's best known opposition figure. As the former leader of the main opposition party - the Forum for Democratic Change - he has run three times against President Museveni in elections and lost each time. He has called for popular protests in Uganda like the ones that lead to the uprisings of the Arab Spring. So why has he failed to mobilise public opinion behind him?