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    Questions over Palin's ambition

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    Al Jazeera English

    by Al Jazeera English

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    Sarah Palin, the self-styled maverick of US politics, has started a tour of US states on the back of a Harley Davidson motorcycle.

    The Tea Party favourite joined bikers in Washington DC to commemorate US war veterans.

    And as Al Jazeera's John Terrett reports, it has also fuelled speculation about a Republican presidential bid.