Well, I'm not against adult stem cell research. The problem with embryonic stem cells is that to get them, you have to destroy a human embryo, again much the same thing as an abortion. Added to this, there are problems with embryonic stem cells. They are what we call totipotent cells, they can become anything. This sounds great at first, until you realize you might get brain cells in your bone marrow, or muscle cells in your spinal cord. They also have an annoying tendency to become in effect cancerous. Embryonic stem cells have yet to cure anything.
Adult stem cells, on the other hand, do not require the death of a person in order to be obtained. These include blood from the umbilical cord of newly born infants, cells from a person's bone marrow, and others. I believe a recent breakthrough turned human skin cells into stem cells. These cells are usually multipotent - they have the ability to become many different cell types. One of the pluses of adult stem cells is that they can be taken from the subject, altered accordingly, and returned. As they are from the person's body, the likelihood that they will be rejected by the immune system is little to none. Adult stem cells have led to the cure of several diseases, such as X-SCID (severe compromised immunity something or another
think Bubble-boy). Yes, about two children came down with a rare form of leukemia due to the stem cells, but both children survived, and now that the phenomenon has occured, steps can be taken to avoid further incidences.
Adult stem cells have shown much more promise in research than their embryonic counterpart, yet for some reason people, both the general public and scientists, seem to ignore them and the good they can do. Everyone is too focused on the as yet unfruitful embryonic stem cells to see that just as much good can be done with a much less controversial set of cells.