David Cameron stumped by Letterman's British history quiz Add to ... AP Video Published Thursday, Sep. 27, 2012 6:44AM EDT Last updated Thursday, Sep. 27, 2012 10:36AM EDT British Prime Minister David Cameron's appearance on Late Show with David Letterman is making waves back at home, after Cameron struggled in Letterman's surprise British history quiz. Watch More Video: Election call could come as early as this weekend Barclays to speed up cost cuts U.K. to clamp down on 'dirty money' housing BP's profits hit by spill charge U.K. growth bounces back Kenya prepares to welcome Obama 'back home' Watch as rescuers tend to a stranded Orca whale in B.C. Vodafone's sales rise steadily Golfer David Hearn not worried about Canadian Open course Obama tells Jon Stewart lessons he has learned in office Beach holidays help lift easyJet clouds Humpbacks wow whale watchers off the B.C. coast George H.W. Bush fractures neck in fall at home U.K.'s jobless rate rises Aerial footage shows the devastation caused by wildfires in B.C. Pentagon announces plans to lift transgender ban South Carolina to remove Confederate flag Aerial footage of B.C. firefighters battling a 425-hectare wildfire BP to pay $18.7-billion after 2010 Gulf of Mexico spill Obama reflects on 'gratifying' week in politics Comments AA More Related to this Story Video: U.K. PM Cameron talks politics on Letterman Video: Ann Romney pays visit to Leno Video: Obama: Romney hasn't 'gotten around a lot'