As the US city of Philadelphia prepares for its most closely watched political primary in generations one significant part of the population seems to have already picked their man. Muslim-American community leaders, activists and voters in the city of brotherly love, as Philadelphia is known, say Barack Obama is by far their preferred candidate. Philadelphia's Muslim community is one of the most significant, in terms of size and in terms of prominence, of all US cities. There are up to 70,000 people worshipping in 34 mosques in the city alone, leading one local leader to describe Philadelphia as "a Mecca...