When Afghanistan goes to the polls, eyes will be on Kandahar. It's a city that once played host to al Qaeda leader Osama bin Laden. Now, it's home to the ultra rich who've made their fortunes after the fall of the Taliban. Many live on a posh housing estate built by family members of President Hamid Karzai. It's a project that has been dogged by allegations of fraud from the start. But Karzai's brother Mahmood is quick to defend his business.