LONDON, ENGLAND - FEBRUARY 18: Prime Minister David Cameron gives a speech on the alternative vote (AV) at the Royal United Services Institute (RUSI) building on February 18, 2011 in London, England.... more 
LONDON, ENGLAND - FEBRUARY 18: Prime Minister David Cameron gives a speech on the alternative vote (AV) at the Royal United Services Institute (RUSI) building on February 18, 2011 in London, England. Britains will vote whether to keep or change the voting system of electing Members of Parliament on May 5. (Photo by Matt Dunham - WPA Pool/Getty Images) less 
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Fri, Feb 18, 2011 9:56 AM EST