But Mr Obama rejected her rhetoric as sabre-rattling on a day when Pennsylvania Dem-ocrats voted in a primary contest that could help decide which of the contenders will face Republican John McCain in November's presidential election. Mr Obama said: "One of the things that we've seen over the last several years is a bunch of talk using words like 'obliterate'. It doesn't actually produce good results. And so I'm not interested in sabre-rattling." As the polls opened for the first US primary in six weeks, opinion polls showed Mrs Clinton with an advantage of five to ten points, down from a 20-point lead when Pennsylvania campaigning began.
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