Referendum promise 'risky strategy'

David Cameron's European Union referendum promise is a "very risky strategy" that will cause four years of uncertainty, the man challenging Angela Merkel to become the next German chancellor has warned.

Peer Steinbrueck, the candidate for the centre-left Social Democrats in this September's elections, said that treaty change would set off a string of referendums - with unpredictable consequences - across the continent.
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