UK's Brown calls for May 6 vote
![UK's Brown calls for May 6 vote](../../attachement/jpg/site1/20100407/00221917e13e0d26150d1e.jpg)
Experts say outcome tough to predict as Conservatives see their appeal slide
BEIJING - British Prime Minister Gordon Brown fired the starting gun on Tuesday for what could be the closest general election contest for a generation.
Until recently, it looked likely the main opposition Conservative party led by fresh-faced 43-year-old David Cameron would romp home to victory.
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