I think you are ignoring this:
"In 1998, privately funded research led to the breakthrough discovery of hESC (Human Embryonic Stem Cells). This prompted the Clinton Administration to re-examine guidelines for federal funding of embryonic research. In 1999, the president's National Bioethics Advisory Commission recommended that hESC harvested from embryos discarded after in vitro fertility treatments, but not from embryos created expressly for experimentation be eligible for federal funding[3]. Even though embryos are always destroyed in the process of harvesting hESC, the Clinton Administration decided that it would be permissible under the Dickey Amendment to fund hESC research as long as such research did not itself directly cause the destruction of an embryo. Therefore, HHS issued its proposed regulation concerning hESC funding in 2001. Enactment of the new guidelines was delayed by the incoming Bush administration which decided to reconsider the issue."
I think that Clinton signed it because he had a republican congress and it was the best he could get, and I think he funded it anyway when the breakthrough came. And I think that bush ended that when he came in. I think that I think that, because that's what happened.