UGANDA’S main opposition candidate in next week's presidential election has swapped his trademark red beret for a helmet and starts each day with shadow-boxing and a prayer to survive a campaign trail he describes as a war zone. Popstar-turned-lawmaker Robert Kyagulanyi Ssentamu, who goes by the name Bobi Wine, is the frontrunner among 10 candidates challenging Yoweri Museveni, who is seeking to extend his 34-year rule in the East African nation at the January 14 vote. While former guerrilla fighter Museveni, 76, has long been seen as a stabilising force in Uganda after the brutal reigns of Milton Obote and…