It's simple: Frist wants to be President. He thinks favoring embryonic stem cell research will help get him there.
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Frist is a generic, ethicless politician. That is EXACTLY why he changed his position of federal funding of stem cell research. Scumbag - loser - limpwristed RINO. This upcoming election in 2008 is going to really show America what Washington is made of...and they are not going to like it.
One things for certain, Frist wouldn't get my support if he were the only Republican running in the primary.