George Washington University internist Matthew Mintz says the safety issue "has been blown way out of proportion" and that the bigger threat is underuse, not overprescribing.

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As well as politicians, the campaign is backed by other high-profile figures, including singers Elton John and George Michael, and journalist and former Conservative MP Matthew Parris.

BBC: UK party leaders back global gay rights campaign

Potter, a full-back with National Rugby League clubs Canterbury Bulldogs, St George and Perth Western Reds, cut his coaching teeth as an assistant to Matthew Elliot at Bradford Bulls from 1996-1998.

BBC: Potter to quit Dragons for Saints

That business does well when deficits increase, as they have under President George W. Bush, and when uncertainty about equities leads more people into treasuries, says Matthew Park, who covers the company for Thomas Wiesel.

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