(Filed: 24/05/2006) Hillary Clinton may be the Democratic front-runner for the presidency but she seems to have a lot to learn about campaigning for the White House. In a weighty speech to journalists at the National Press Club in Washington yesterday, the senator squandered an opportunity to shine before a critically important audience - the journalists who will present her to the public if, as expected, she declares her candidacy for the 2008 nomination. It began well enough. Resplendent in a lemon yellow two-piece and expensively bejewelled, her star power was plain the moment she entered the room. Everywhere, necks...