Is Gordon Brown Really in a Position to Speak on Robert Mugabe of Zimbabwe?

Before I proceed, I am in no means a supporter of Robert Mugabe remaining in power, I am simply making making an observation here which I hope generates interesting answers. Gordon Brown the U.K. prime minister was not elected by a single person in the country. Labour was in charge because Tony Blair won the elections in 1997 I believe it was. Tony Blair stepped down in 2007 and Gordon came in (as is normal in British politics). Now granted he was admired and respected by most people at first, but at the moment, the guys approval ratings with the public is nothing short of distugsting and he wont agree to hold a new set of elections to select the Prime Minister even when all the by-elections show that his party is in the dumps. Obviously, it would be unwise of him to hold elections now cause he is most definitely going to lose by a mile but isn't that what Mugabe did (though in a rather horrific way). Is Gordon therefore fit to dictate Mugabe's fate? Is Bush for that matter?