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(AP) --  Lance Armstrong has overcome cancer, rival
cyclists and nagging allegations of doping to become one of the
world's best-paid athletes and a sought-after pitchmen.

 He's also turned the Lance Armstrong Foundation, better known as
Livestrong, into one of the top 10 groups funding cancer research
in the United States.

 The Armstrong brand is one of the best in sports. All of that is
being threatened by a new opponent: federal investigators probing
allegations that Armstrong used performance-enhancing drugs and
tried to cover it up.

 Philanthropy experts say the foundation could lose future
donations if its namesake and chairman is dragged down in scandal.
 Armstrong says the foundation won't be distracted by what he
calls a "witch hunt."

(Copyright ©2010 by The Associated Press. All Rights Reserved.)