Michele Bachmann
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Tea Party's Michele Bachmann runs for president

A Republican Congresswoman, who is a favourite of the influential Tea Party movement, has formally joined the race for next year's US presidential election.

Michele Bachmann is an economic conservative and a fierce opponent of abortion and gay marriage.

She has described herself as a 'bold choice' for president.

The latest polls in Iowa, her home state, have shown that she is neck and neck with the Republican front runner, Mitt Romney.

Mark Mardell reports.

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