LONDON (AFP) – US President Barack Obama's half brother was refused a visa to enter Britain because he had been accused of a serious crime on a previous visit, it was reported Saturday. Samson Obama was stopped by immigration officials at East Midlands Airport in January on his way to Washington for the president's inauguration, the Sunday newspaper News of the World reported, according to advance excerpts. Biometric tests alerted the authorities that Samson, a Kenyan mobile phone shop manager, had previously been arrested by police in Berkshire. That arrest followed an alleged sex attack on a British girl two...