On May 24th Barack Obama launched a blistering attack on Mitt Romney's business background from the state fairgrounds in Iowa. A week later Mr Romney returned the favour from a furniture warehouse in Las Vegas, Nevada. The choice of venues was hardly random. Both are in "swing" states that will help determine the outcome of this November's election. With the economy at the top of voters' concerns, how the recovery is seen to be faring in such states could have an outsize influence on the result.
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