LAMAR, Colo. (Reuters) - Democratic challenger John Kerry on Saturday marked the third anniversary of President Bush's restrictions on stem cell research by vowing to lift them for the sake of millions of Americans with debilitating diseases.

"To those who pray each day for cures that are now beyond our reach, I want you to know that help is on the way," Kerry said in remarks taped for his party's weekly radio address in the second week of a cross-country campaign tour with vice-presidential running mate John Edwards...

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