Backdropped by the historic Tower Bridge, a giant Olympic Rings floats on the River Thames in London in the run-up for the Olympic games, during its launch to mark 150-days until the start of the London 2012 Olympic games, Tuesday, Feb. 28, 2012. (AP Photo/Sang Tan)

Associated Press
Backdropped by the historic Tower Bridge, a giant Olympic Rings floats on the River Thames in London in the run-up for the Olympic games, during its launch to mark 150-days until the start of the London 2012 Olympic games, Tuesday, Feb. 28, 2012.  (AP Photo/Sang Tan)
Backdropped by the historic Tower Bridge, a giant Olympic Rings floats on the River Thames in London in the run-up for the Olympic games, during its launch to mark 150-days until the start of the London 2012 Olympic games, Tuesday, Feb. 28, 2012. (AP Photo/Sang Tan)
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