Obama's attack dog: Outspoken Biden joins the Democratic ticket
Barack Obama's campaign for the White House was back in its groove yesterday, when he called upon the political equivalent of Big Bertha by naming Senator Joe Biden to be his vice-presidential running mate.
Mr Biden is the Democrats' most powerful voice on foreign policy, and has been a lacerating critic of John McCain's big-stick vision of America's role in the world, especially when it comes to Iraq and Iran.
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