Former President Bill Clinton will shrug off his recent heart surgery and hit the campaign trail tomorrow to stump for Democrat challenger John Kerry. Clinton's eleventh-hour appearance on the US electoral landscape comes amid a last push by the Democrats as they seek to overturn President George W Bush's slender poll advantage in the last full week of campaigning. Clinton will appear with Kerry in Philadelphia, in the key swing state of Pennsylvania. He is likely to make further campaign stops and numerous media appearances as election day approaches on 2 November. Kerry aides hope Clinton, who is still popular...