US President Barack Obama has arrived in Johannesburg on a visit set to be dominated by global concern about the health of Nelson Mandela.<br /><br />Obama played down speculation that he might visit the anti-apartheid leader, who he has described as a 'personal hero', in hospital.<br /><br />Mandela is in serious condition in a Pretoria clinic, where a crowd of well-wishers have kept a vigil for days. <br /><br />...<br />http://www.euronews.net/
