US presidential hopeful Barack Obama's 67-year-old step mother, Kezia Obama, believes that he will change the way the world thinks once he takes charge at the White House in Washington. As he arrived in London on Saturday, Kezia Obama, Barack Senior's first wife, said proudly: "The things Barry Junior says are the things the world needs to focus on." "I believe he's the right person at the right time. He's the one to make the changes we need. If he does win he will be a president for the whole world," The Mirror quoted her, as saying. Kezia describes herself...