As speculation builds that presumptive GOP nominee Mitt Romney has his eye on the charismatic 40-year-old Cuban-American as a possible running mate, political observers want to learn everything they can about him.

CNN: Why Marco Rubio can't save the GOP

But what we want to see from this summit, and we're observers and what they do is their business not ours, this is not like some of the meetings Mugabe's been to in Europe.

BBC: Interview with Lord Malloch Brown

But in order to do that they need the recommendations of Commonwealth observers who've been monitoring the elections in Zimbabwe - and the key thing they want to know is whether the elections were free and fair.

BBC: Six forum: BBC correspondent Rageh Omaar